1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/defaultMethods.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/verificationType.hpp" 35 #include "classfile/verifier.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "memory/allocation.hpp" 38 #include "memory/gcLocker.hpp" 39 #include "memory/metadataFactory.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/referenceType.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/constantPool.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/instanceMirrorKlass.hpp" 47 #include "oops/klass.inline.hpp" 48 #include "oops/klassVtable.hpp" 49 #include "oops/method.hpp" 50 #include "oops/symbol.hpp" 51 #include "prims/jvm.h" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/jvmtiThreadState.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/perfData.hpp" 56 #include "runtime/reflection.hpp" 57 #include "runtime/signature.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/classLoadingService.hpp" 60 #include "services/threadService.hpp" 61 #include "utilities/array.hpp" 62 #include "utilities/globalDefinitions.hpp" 63 #include "utilities/macros.hpp" 64 #include "utilities/ostream.hpp" 65 #if INCLUDE_CDS 66 #include "classfile/systemDictionaryShared.hpp" 67 #endif 68 69 // We generally try to create the oops directly when parsing, rather than 70 // allocating temporary data structures and copying the bytes twice. A 71 // temporary area is only needed when parsing utf8 entries in the constant 72 // pool and when parsing line number tables. 73 74 // We add assert in debug mode when class format is not checked. 75 76 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 77 #define JAVA_MIN_SUPPORTED_VERSION 45 78 #define JAVA_MAX_SUPPORTED_VERSION 52 79 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 80 81 // Used for two backward compatibility reasons: 82 // - to check for new additions to the class file format in JDK1.5 83 // - to check for bug fixes in the format checker in JDK1.5 84 #define JAVA_1_5_VERSION 49 85 86 // Used for backward compatibility reasons: 87 // - to check for javac bug fixes that happened after 1.5 88 // - also used as the max version when running in jdk6 89 #define JAVA_6_VERSION 50 90 91 // Used for backward compatibility reasons: 92 // - to check NameAndType_info signatures more aggressively 93 #define JAVA_7_VERSION 51 94 95 // Extension method support. 96 #define JAVA_8_VERSION 52 97 98 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 99 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 100 // this function (_current can be allocated in a register, with scalar 101 // replacement of aggregates). The _current pointer is copied back to 102 // stream() when this function returns. DON'T call another method within 103 // this method that uses stream(). 104 ClassFileStream* cfs0 = stream(); 105 ClassFileStream cfs1 = *cfs0; 106 ClassFileStream* cfs = &cfs1; 107 #ifdef ASSERT 108 assert(cfs->allocated_on_stack(),"should be local"); 109 u1* old_current = cfs0->current(); 110 #endif 111 Handle class_loader(THREAD, _loader_data->class_loader()); 112 113 // Used for batching symbol allocations. 114 const char* names[SymbolTable::symbol_alloc_batch_size]; 115 int lengths[SymbolTable::symbol_alloc_batch_size]; 116 int indices[SymbolTable::symbol_alloc_batch_size]; 117 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 118 int names_count = 0; 119 120 // parsing Index 0 is unused 121 for (int index = 1; index < length; index++) { 122 // Each of the following case guarantees one more byte in the stream 123 // for the following tag or the access_flags following constant pool, 124 // so we don't need bounds-check for reading tag. 125 u1 tag = cfs->get_u1_fast(); 126 switch (tag) { 127 case JVM_CONSTANT_Class : 128 { 129 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 130 u2 name_index = cfs->get_u2_fast(); 131 _cp->klass_index_at_put(index, name_index); 132 } 133 break; 134 case JVM_CONSTANT_Fieldref : 135 { 136 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 137 u2 class_index = cfs->get_u2_fast(); 138 u2 name_and_type_index = cfs->get_u2_fast(); 139 _cp->field_at_put(index, class_index, name_and_type_index); 140 } 141 break; 142 case JVM_CONSTANT_Methodref : 143 { 144 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 145 u2 class_index = cfs->get_u2_fast(); 146 u2 name_and_type_index = cfs->get_u2_fast(); 147 _cp->method_at_put(index, class_index, name_and_type_index); 148 } 149 break; 150 case JVM_CONSTANT_InterfaceMethodref : 151 { 152 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 153 u2 class_index = cfs->get_u2_fast(); 154 u2 name_and_type_index = cfs->get_u2_fast(); 155 _cp->interface_method_at_put(index, class_index, name_and_type_index); 156 } 157 break; 158 case JVM_CONSTANT_String : 159 { 160 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 161 u2 string_index = cfs->get_u2_fast(); 162 _cp->string_index_at_put(index, string_index); 163 } 164 break; 165 case JVM_CONSTANT_MethodHandle : 166 case JVM_CONSTANT_MethodType : 167 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 168 classfile_parse_error( 169 "Class file version does not support constant tag %u in class file %s", 170 tag, CHECK); 171 } 172 if (tag == JVM_CONSTANT_MethodHandle) { 173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 174 u1 ref_kind = cfs->get_u1_fast(); 175 u2 method_index = cfs->get_u2_fast(); 176 _cp->method_handle_index_at_put(index, ref_kind, method_index); 177 } else if (tag == JVM_CONSTANT_MethodType) { 178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 179 u2 signature_index = cfs->get_u2_fast(); 180 _cp->method_type_index_at_put(index, signature_index); 181 } else { 182 ShouldNotReachHere(); 183 } 184 break; 185 case JVM_CONSTANT_InvokeDynamic : 186 { 187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 188 classfile_parse_error( 189 "Class file version does not support constant tag %u in class file %s", 190 tag, CHECK); 191 } 192 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 193 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 194 u2 name_and_type_index = cfs->get_u2_fast(); 195 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 196 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 197 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 198 } 199 break; 200 case JVM_CONSTANT_Integer : 201 { 202 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 203 u4 bytes = cfs->get_u4_fast(); 204 _cp->int_at_put(index, (jint) bytes); 205 } 206 break; 207 case JVM_CONSTANT_Float : 208 { 209 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 210 u4 bytes = cfs->get_u4_fast(); 211 _cp->float_at_put(index, *(jfloat*)&bytes); 212 } 213 break; 214 case JVM_CONSTANT_Long : 215 // A mangled type might cause you to overrun allocated memory 216 guarantee_property(index+1 < length, 217 "Invalid constant pool entry %u in class file %s", 218 index, CHECK); 219 { 220 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 221 u8 bytes = cfs->get_u8_fast(); 222 _cp->long_at_put(index, bytes); 223 } 224 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 225 break; 226 case JVM_CONSTANT_Double : 227 // A mangled type might cause you to overrun allocated memory 228 guarantee_property(index+1 < length, 229 "Invalid constant pool entry %u in class file %s", 230 index, CHECK); 231 { 232 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 233 u8 bytes = cfs->get_u8_fast(); 234 _cp->double_at_put(index, *(jdouble*)&bytes); 235 } 236 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 237 break; 238 case JVM_CONSTANT_NameAndType : 239 { 240 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 241 u2 name_index = cfs->get_u2_fast(); 242 u2 signature_index = cfs->get_u2_fast(); 243 _cp->name_and_type_at_put(index, name_index, signature_index); 244 } 245 break; 246 case JVM_CONSTANT_Utf8 : 247 { 248 cfs->guarantee_more(2, CHECK); // utf8_length 249 u2 utf8_length = cfs->get_u2_fast(); 250 u1* utf8_buffer = cfs->get_u1_buffer(); 251 assert(utf8_buffer != NULL, "null utf8 buffer"); 252 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 253 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 254 cfs->skip_u1_fast(utf8_length); 255 256 // Before storing the symbol, make sure it's legal 257 if (_need_verify) { 258 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 259 } 260 261 if (has_cp_patch_at(index)) { 262 Handle patch = clear_cp_patch_at(index); 263 guarantee_property(java_lang_String::is_instance(patch()), 264 "Illegal utf8 patch at %d in class file %s", 265 index, CHECK); 266 char* str = java_lang_String::as_utf8_string(patch()); 267 // (could use java_lang_String::as_symbol instead, but might as well batch them) 268 utf8_buffer = (u1*) str; 269 utf8_length = (int) strlen(str); 270 } 271 272 unsigned int hash; 273 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 274 if (result == NULL) { 275 names[names_count] = (char*)utf8_buffer; 276 lengths[names_count] = utf8_length; 277 indices[names_count] = index; 278 hashValues[names_count++] = hash; 279 if (names_count == SymbolTable::symbol_alloc_batch_size) { 280 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 281 names_count = 0; 282 } 283 } else { 284 _cp->symbol_at_put(index, result); 285 } 286 } 287 break; 288 default: 289 classfile_parse_error( 290 "Unknown constant tag %u in class file %s", tag, CHECK); 291 break; 292 } 293 } 294 295 // Allocate the remaining symbols 296 if (names_count > 0) { 297 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 298 } 299 300 // Copy _current pointer of local copy back to stream(). 301 #ifdef ASSERT 302 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 303 #endif 304 cfs0->set_current(cfs1.current()); 305 } 306 307 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 308 309 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 310 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 311 return cp->symbol_at(index); 312 else 313 return NULL; 314 } 315 316 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 317 ClassFileStream* cfs = stream(); 318 constantPoolHandle nullHandle; 319 320 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 321 u2 length = cfs->get_u2_fast(); 322 guarantee_property( 323 length >= 1, "Illegal constant pool size %u in class file %s", 324 length, CHECK_(nullHandle)); 325 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 326 CHECK_(nullHandle)); 327 _cp = constant_pool; // save in case of errors 328 constantPoolHandle cp (THREAD, constant_pool); 329 330 // parsing constant pool entries 331 parse_constant_pool_entries(length, CHECK_(nullHandle)); 332 333 int index = 1; // declared outside of loops for portability 334 335 // first verification pass - validate cross references and fixup class and string constants 336 for (index = 1; index < length; index++) { // Index 0 is unused 337 jbyte tag = cp->tag_at(index).value(); 338 switch (tag) { 339 case JVM_CONSTANT_Class : 340 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 341 break; 342 case JVM_CONSTANT_Fieldref : 343 // fall through 344 case JVM_CONSTANT_Methodref : 345 // fall through 346 case JVM_CONSTANT_InterfaceMethodref : { 347 if (!_need_verify) break; 348 int klass_ref_index = cp->klass_ref_index_at(index); 349 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 350 check_property(valid_klass_reference_at(klass_ref_index), 351 "Invalid constant pool index %u in class file %s", 352 klass_ref_index, 353 CHECK_(nullHandle)); 354 check_property(valid_cp_range(name_and_type_ref_index, length) && 355 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 356 "Invalid constant pool index %u in class file %s", 357 name_and_type_ref_index, 358 CHECK_(nullHandle)); 359 break; 360 } 361 case JVM_CONSTANT_String : 362 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 363 break; 364 case JVM_CONSTANT_Integer : 365 break; 366 case JVM_CONSTANT_Float : 367 break; 368 case JVM_CONSTANT_Long : 369 case JVM_CONSTANT_Double : 370 index++; 371 check_property( 372 (index < length && cp->tag_at(index).is_invalid()), 373 "Improper constant pool long/double index %u in class file %s", 374 index, CHECK_(nullHandle)); 375 break; 376 case JVM_CONSTANT_NameAndType : { 377 if (!_need_verify) break; 378 int name_ref_index = cp->name_ref_index_at(index); 379 int signature_ref_index = cp->signature_ref_index_at(index); 380 check_property(valid_symbol_at(name_ref_index), 381 "Invalid constant pool index %u in class file %s", 382 name_ref_index, CHECK_(nullHandle)); 383 check_property(valid_symbol_at(signature_ref_index), 384 "Invalid constant pool index %u in class file %s", 385 signature_ref_index, CHECK_(nullHandle)); 386 break; 387 } 388 case JVM_CONSTANT_Utf8 : 389 break; 390 case JVM_CONSTANT_UnresolvedClass : // fall-through 391 case JVM_CONSTANT_UnresolvedClassInError: 392 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 393 break; 394 case JVM_CONSTANT_ClassIndex : 395 { 396 int class_index = cp->klass_index_at(index); 397 check_property(valid_symbol_at(class_index), 398 "Invalid constant pool index %u in class file %s", 399 class_index, CHECK_(nullHandle)); 400 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 401 } 402 break; 403 case JVM_CONSTANT_StringIndex : 404 { 405 int string_index = cp->string_index_at(index); 406 check_property(valid_symbol_at(string_index), 407 "Invalid constant pool index %u in class file %s", 408 string_index, CHECK_(nullHandle)); 409 Symbol* sym = cp->symbol_at(string_index); 410 cp->unresolved_string_at_put(index, sym); 411 } 412 break; 413 case JVM_CONSTANT_MethodHandle : 414 { 415 int ref_index = cp->method_handle_index_at(index); 416 check_property( 417 valid_cp_range(ref_index, length), 418 "Invalid constant pool index %u in class file %s", 419 ref_index, CHECK_(nullHandle)); 420 constantTag tag = cp->tag_at(ref_index); 421 int ref_kind = cp->method_handle_ref_kind_at(index); 422 switch (ref_kind) { 423 case JVM_REF_getField: 424 case JVM_REF_getStatic: 425 case JVM_REF_putField: 426 case JVM_REF_putStatic: 427 check_property( 428 tag.is_field(), 429 "Invalid constant pool index %u in class file %s (not a field)", 430 ref_index, CHECK_(nullHandle)); 431 break; 432 case JVM_REF_invokeVirtual: 433 case JVM_REF_newInvokeSpecial: 434 check_property( 435 tag.is_method(), 436 "Invalid constant pool index %u in class file %s (not a method)", 437 ref_index, CHECK_(nullHandle)); 438 break; 439 case JVM_REF_invokeStatic: 440 case JVM_REF_invokeSpecial: 441 check_property(tag.is_method() || 442 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 443 "Invalid constant pool index %u in class file %s (not a method)", 444 ref_index, CHECK_(nullHandle)); 445 break; 446 case JVM_REF_invokeInterface: 447 check_property( 448 tag.is_interface_method(), 449 "Invalid constant pool index %u in class file %s (not an interface method)", 450 ref_index, CHECK_(nullHandle)); 451 break; 452 default: 453 classfile_parse_error( 454 "Bad method handle kind at constant pool index %u in class file %s", 455 index, CHECK_(nullHandle)); 456 } 457 // Keep the ref_index unchanged. It will be indirected at link-time. 458 } 459 break; 460 case JVM_CONSTANT_MethodType : 461 { 462 int ref_index = cp->method_type_index_at(index); 463 check_property(valid_symbol_at(ref_index), 464 "Invalid constant pool index %u in class file %s", 465 ref_index, CHECK_(nullHandle)); 466 } 467 break; 468 case JVM_CONSTANT_InvokeDynamic : 469 { 470 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 471 check_property(valid_cp_range(name_and_type_ref_index, length) && 472 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 473 "Invalid constant pool index %u in class file %s", 474 name_and_type_ref_index, 475 CHECK_(nullHandle)); 476 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 477 break; 478 } 479 default: 480 fatal(err_msg("bad constant pool tag value %u", 481 cp->tag_at(index).value())); 482 ShouldNotReachHere(); 483 break; 484 } // end of switch 485 } // end of for 486 487 if (_cp_patches != NULL) { 488 // need to treat this_class specially... 489 int this_class_index; 490 { 491 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 492 u1* mark = cfs->current(); 493 u2 flags = cfs->get_u2_fast(); 494 this_class_index = cfs->get_u2_fast(); 495 cfs->set_current(mark); // revert to mark 496 } 497 498 for (index = 1; index < length; index++) { // Index 0 is unused 499 if (has_cp_patch_at(index)) { 500 guarantee_property(index != this_class_index, 501 "Illegal constant pool patch to self at %d in class file %s", 502 index, CHECK_(nullHandle)); 503 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 504 } 505 } 506 } 507 508 if (!_need_verify) { 509 return cp; 510 } 511 512 // second verification pass - checks the strings are of the right format. 513 // but not yet to the other entries 514 for (index = 1; index < length; index++) { 515 jbyte tag = cp->tag_at(index).value(); 516 switch (tag) { 517 case JVM_CONSTANT_UnresolvedClass: { 518 Symbol* class_name = cp->klass_name_at(index); 519 // check the name, even if _cp_patches will overwrite it 520 verify_legal_class_name(class_name, CHECK_(nullHandle)); 521 break; 522 } 523 case JVM_CONSTANT_NameAndType: { 524 if (_need_verify && _major_version >= JAVA_7_VERSION) { 525 int sig_index = cp->signature_ref_index_at(index); 526 int name_index = cp->name_ref_index_at(index); 527 Symbol* name = cp->symbol_at(name_index); 528 Symbol* sig = cp->symbol_at(sig_index); 529 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 530 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 531 } else { 532 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 533 } 534 } 535 break; 536 } 537 case JVM_CONSTANT_InvokeDynamic: 538 case JVM_CONSTANT_Fieldref: 539 case JVM_CONSTANT_Methodref: 540 case JVM_CONSTANT_InterfaceMethodref: { 541 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 542 // already verified to be utf8 543 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 544 // already verified to be utf8 545 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 546 Symbol* name = cp->symbol_at(name_ref_index); 547 Symbol* signature = cp->symbol_at(signature_ref_index); 548 if (tag == JVM_CONSTANT_Fieldref) { 549 verify_legal_field_name(name, CHECK_(nullHandle)); 550 if (_need_verify && _major_version >= JAVA_7_VERSION) { 551 // Signature is verified above, when iterating NameAndType_info. 552 // Need only to be sure it's the right type. 553 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 554 throwIllegalSignature( 555 "Field", name, signature, CHECK_(nullHandle)); 556 } 557 } else { 558 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 559 } 560 } else { 561 verify_legal_method_name(name, CHECK_(nullHandle)); 562 if (_need_verify && _major_version >= JAVA_7_VERSION) { 563 // Signature is verified above, when iterating NameAndType_info. 564 // Need only to be sure it's the right type. 565 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 566 throwIllegalSignature( 567 "Method", name, signature, CHECK_(nullHandle)); 568 } 569 } else { 570 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 571 } 572 if (tag == JVM_CONSTANT_Methodref) { 573 // 4509014: If a class method name begins with '<', it must be "<init>". 574 assert(name != NULL, "method name in constant pool is null"); 575 unsigned int name_len = name->utf8_length(); 576 assert(name_len > 0, "bad method name"); // already verified as legal name 577 if (name->byte_at(0) == '<') { 578 if (name != vmSymbols::object_initializer_name()) { 579 classfile_parse_error( 580 "Bad method name at constant pool index %u in class file %s", 581 name_ref_index, CHECK_(nullHandle)); 582 } 583 } 584 } 585 } 586 break; 587 } 588 case JVM_CONSTANT_MethodHandle: { 589 int ref_index = cp->method_handle_index_at(index); 590 int ref_kind = cp->method_handle_ref_kind_at(index); 591 switch (ref_kind) { 592 case JVM_REF_invokeVirtual: 593 case JVM_REF_invokeStatic: 594 case JVM_REF_invokeSpecial: 595 case JVM_REF_newInvokeSpecial: 596 { 597 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 598 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 599 Symbol* name = cp->symbol_at(name_ref_index); 600 if (ref_kind == JVM_REF_newInvokeSpecial) { 601 if (name != vmSymbols::object_initializer_name()) { 602 classfile_parse_error( 603 "Bad constructor name at constant pool index %u in class file %s", 604 name_ref_index, CHECK_(nullHandle)); 605 } 606 } else { 607 if (name == vmSymbols::object_initializer_name()) { 608 classfile_parse_error( 609 "Bad method name at constant pool index %u in class file %s", 610 name_ref_index, CHECK_(nullHandle)); 611 } 612 } 613 } 614 break; 615 // Other ref_kinds are already fully checked in previous pass. 616 } 617 break; 618 } 619 case JVM_CONSTANT_MethodType: { 620 Symbol* no_name = vmSymbols::type_name(); // place holder 621 Symbol* signature = cp->method_type_signature_at(index); 622 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 623 break; 624 } 625 case JVM_CONSTANT_Utf8: { 626 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 627 } 628 } // end of switch 629 } // end of for 630 631 return cp; 632 } 633 634 635 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 636 BasicType patch_type = T_VOID; 637 638 switch (cp->tag_at(index).value()) { 639 640 case JVM_CONSTANT_UnresolvedClass : 641 // Patching a class means pre-resolving it. 642 // The name in the constant pool is ignored. 643 if (java_lang_Class::is_instance(patch())) { 644 guarantee_property(!java_lang_Class::is_primitive(patch()), 645 "Illegal class patch at %d in class file %s", 646 index, CHECK); 647 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 648 } else { 649 guarantee_property(java_lang_String::is_instance(patch()), 650 "Illegal class patch at %d in class file %s", 651 index, CHECK); 652 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 653 cp->unresolved_klass_at_put(index, name); 654 } 655 break; 656 657 case JVM_CONSTANT_String : 658 // skip this patch and don't clear it. Needs the oop array for resolved 659 // references to be created first. 660 return; 661 662 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 663 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 664 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 665 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 666 patch_prim: 667 { 668 jvalue value; 669 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 670 guarantee_property(value_type == patch_type, 671 "Illegal primitive patch at %d in class file %s", 672 index, CHECK); 673 switch (value_type) { 674 case T_INT: cp->int_at_put(index, value.i); break; 675 case T_FLOAT: cp->float_at_put(index, value.f); break; 676 case T_LONG: cp->long_at_put(index, value.j); break; 677 case T_DOUBLE: cp->double_at_put(index, value.d); break; 678 default: assert(false, ""); 679 } 680 } 681 break; 682 683 default: 684 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 685 guarantee_property(!has_cp_patch_at(index), 686 "Illegal unexpected patch at %d in class file %s", 687 index, CHECK); 688 return; 689 } 690 691 // On fall-through, mark the patch as used. 692 clear_cp_patch_at(index); 693 } 694 695 696 697 class NameSigHash: public ResourceObj { 698 public: 699 Symbol* _name; // name 700 Symbol* _sig; // signature 701 NameSigHash* _next; // Next entry in hash table 702 }; 703 704 705 #define HASH_ROW_SIZE 256 706 707 unsigned int hash(Symbol* name, Symbol* sig) { 708 unsigned int raw_hash = 0; 709 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 710 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 711 712 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 713 } 714 715 716 void initialize_hashtable(NameSigHash** table) { 717 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 718 } 719 720 // Return false if the name/sig combination is found in table. 721 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 722 // The old format checker uses heap sort to find duplicates. 723 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 724 // of table since we don't expect Symbol*'s to move. 725 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 726 assert(name != NULL, "name in constant pool is NULL"); 727 728 // First lookup for duplicates 729 int index = hash(name, sig); 730 NameSigHash* entry = table[index]; 731 while (entry != NULL) { 732 if (entry->_name == name && entry->_sig == sig) { 733 return false; 734 } 735 entry = entry->_next; 736 } 737 738 // No duplicate is found, allocate a new entry and fill it. 739 entry = new NameSigHash(); 740 entry->_name = name; 741 entry->_sig = sig; 742 743 // Insert into hash table 744 entry->_next = table[index]; 745 table[index] = entry; 746 747 return true; 748 } 749 750 751 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 752 Handle protection_domain, 753 Symbol* class_name, 754 bool* has_default_methods, 755 TRAPS) { 756 if (length == 0) { 757 _local_interfaces = Universe::the_empty_klass_array(); 758 } else { 759 ClassFileStream* cfs = stream(); 760 assert(length > 0, "only called for length>0"); 761 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 762 763 int index; 764 for (index = 0; index < length; index++) { 765 u2 interface_index = cfs->get_u2(CHECK_NULL); 766 KlassHandle interf; 767 check_property( 768 valid_klass_reference_at(interface_index), 769 "Interface name has bad constant pool index %u in class file %s", 770 interface_index, CHECK_NULL); 771 if (_cp->tag_at(interface_index).is_klass()) { 772 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 773 } else { 774 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 775 776 // Don't need to check legal name because it's checked when parsing constant pool. 777 // But need to make sure it's not an array type. 778 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 779 "Bad interface name in class file %s", CHECK_NULL); 780 Handle class_loader(THREAD, _loader_data->class_loader()); 781 782 // Call resolve_super so classcircularity is checked 783 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 784 unresolved_klass, class_loader, protection_domain, 785 false, CHECK_NULL); 786 interf = KlassHandle(THREAD, k); 787 } 788 789 if (!interf()->is_interface()) { 790 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 791 } 792 if (InstanceKlass::cast(interf())->has_default_methods()) { 793 *has_default_methods = true; 794 } 795 _local_interfaces->at_put(index, interf()); 796 } 797 798 if (!_need_verify || length <= 1) { 799 return _local_interfaces; 800 } 801 802 // Check if there's any duplicates in interfaces 803 ResourceMark rm(THREAD); 804 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 805 THREAD, NameSigHash*, HASH_ROW_SIZE); 806 initialize_hashtable(interface_names); 807 bool dup = false; 808 { 809 debug_only(No_Safepoint_Verifier nsv;) 810 for (index = 0; index < length; index++) { 811 Klass* k = _local_interfaces->at(index); 812 Symbol* name = InstanceKlass::cast(k)->name(); 813 // If no duplicates, add (name, NULL) in hashtable interface_names. 814 if (!put_after_lookup(name, NULL, interface_names)) { 815 dup = true; 816 break; 817 } 818 } 819 } 820 if (dup) { 821 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 822 } 823 } 824 return _local_interfaces; 825 } 826 827 828 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 829 // Make sure the constant pool entry is of a type appropriate to this field 830 guarantee_property( 831 (constantvalue_index > 0 && 832 constantvalue_index < _cp->length()), 833 "Bad initial value index %u in ConstantValue attribute in class file %s", 834 constantvalue_index, CHECK); 835 constantTag value_type = _cp->tag_at(constantvalue_index); 836 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 837 case T_LONG: 838 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 839 break; 840 case T_FLOAT: 841 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 842 break; 843 case T_DOUBLE: 844 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 845 break; 846 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 847 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 848 break; 849 case T_OBJECT: 850 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 851 && value_type.is_string()), 852 "Bad string initial value in class file %s", CHECK); 853 break; 854 default: 855 classfile_parse_error( 856 "Unable to set initial value %u in class file %s", 857 constantvalue_index, CHECK); 858 } 859 } 860 861 862 // Parse attributes for a field. 863 void ClassFileParser::parse_field_attributes(u2 attributes_count, 864 bool is_static, u2 signature_index, 865 u2* constantvalue_index_addr, 866 bool* is_synthetic_addr, 867 u2* generic_signature_index_addr, 868 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 869 TRAPS) { 870 ClassFileStream* cfs = stream(); 871 assert(attributes_count > 0, "length should be greater than 0"); 872 u2 constantvalue_index = 0; 873 u2 generic_signature_index = 0; 874 bool is_synthetic = false; 875 u1* runtime_visible_annotations = NULL; 876 int runtime_visible_annotations_length = 0; 877 u1* runtime_invisible_annotations = NULL; 878 int runtime_invisible_annotations_length = 0; 879 u1* runtime_visible_type_annotations = NULL; 880 int runtime_visible_type_annotations_length = 0; 881 u1* runtime_invisible_type_annotations = NULL; 882 int runtime_invisible_type_annotations_length = 0; 883 bool runtime_invisible_annotations_exists = false; 884 bool runtime_invisible_type_annotations_exists = false; 885 while (attributes_count--) { 886 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 887 u2 attribute_name_index = cfs->get_u2_fast(); 888 u4 attribute_length = cfs->get_u4_fast(); 889 check_property(valid_symbol_at(attribute_name_index), 890 "Invalid field attribute index %u in class file %s", 891 attribute_name_index, 892 CHECK); 893 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 894 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 895 // ignore if non-static 896 if (constantvalue_index != 0) { 897 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 898 } 899 check_property( 900 attribute_length == 2, 901 "Invalid ConstantValue field attribute length %u in class file %s", 902 attribute_length, CHECK); 903 constantvalue_index = cfs->get_u2(CHECK); 904 if (_need_verify) { 905 verify_constantvalue(constantvalue_index, signature_index, CHECK); 906 } 907 } else if (attribute_name == vmSymbols::tag_synthetic()) { 908 if (attribute_length != 0) { 909 classfile_parse_error( 910 "Invalid Synthetic field attribute length %u in class file %s", 911 attribute_length, CHECK); 912 } 913 is_synthetic = true; 914 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 915 if (attribute_length != 0) { 916 classfile_parse_error( 917 "Invalid Deprecated field attribute length %u in class file %s", 918 attribute_length, CHECK); 919 } 920 } else if (_major_version >= JAVA_1_5_VERSION) { 921 if (attribute_name == vmSymbols::tag_signature()) { 922 if (attribute_length != 2) { 923 classfile_parse_error( 924 "Wrong size %u for field's Signature attribute in class file %s", 925 attribute_length, CHECK); 926 } 927 generic_signature_index = parse_generic_signature_attribute(CHECK); 928 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 929 if (runtime_visible_annotations != NULL) { 930 classfile_parse_error( 931 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 932 } 933 runtime_visible_annotations_length = attribute_length; 934 runtime_visible_annotations = cfs->get_u1_buffer(); 935 assert(runtime_visible_annotations != NULL, "null visible annotations"); 936 parse_annotations(runtime_visible_annotations, 937 runtime_visible_annotations_length, 938 parsed_annotations, 939 CHECK); 940 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 941 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 942 if (runtime_invisible_annotations_exists) { 943 classfile_parse_error( 944 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 945 } 946 runtime_invisible_annotations_exists = true; 947 if (PreserveAllAnnotations) { 948 runtime_invisible_annotations_length = attribute_length; 949 runtime_invisible_annotations = cfs->get_u1_buffer(); 950 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 951 } 952 cfs->skip_u1(attribute_length, CHECK); 953 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 954 if (runtime_visible_type_annotations != NULL) { 955 classfile_parse_error( 956 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 957 } 958 runtime_visible_type_annotations_length = attribute_length; 959 runtime_visible_type_annotations = cfs->get_u1_buffer(); 960 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 961 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 962 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 963 if (runtime_invisible_type_annotations_exists) { 964 classfile_parse_error( 965 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 966 } else { 967 runtime_invisible_type_annotations_exists = true; 968 } 969 if (PreserveAllAnnotations) { 970 runtime_invisible_type_annotations_length = attribute_length; 971 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 972 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 973 } 974 cfs->skip_u1(attribute_length, CHECK); 975 } else { 976 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 977 } 978 } else { 979 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 980 } 981 } 982 983 *constantvalue_index_addr = constantvalue_index; 984 *is_synthetic_addr = is_synthetic; 985 *generic_signature_index_addr = generic_signature_index; 986 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 987 runtime_visible_annotations_length, 988 runtime_invisible_annotations, 989 runtime_invisible_annotations_length, 990 CHECK); 991 parsed_annotations->set_field_annotations(a); 992 a = assemble_annotations(runtime_visible_type_annotations, 993 runtime_visible_type_annotations_length, 994 runtime_invisible_type_annotations, 995 runtime_invisible_type_annotations_length, 996 CHECK); 997 parsed_annotations->set_field_type_annotations(a); 998 return; 999 } 1000 1001 1002 // Field allocation types. Used for computing field offsets. 1003 1004 enum FieldAllocationType { 1005 STATIC_OOP, // Oops 1006 STATIC_BYTE, // Boolean, Byte, char 1007 STATIC_SHORT, // shorts 1008 STATIC_WORD, // ints 1009 STATIC_DOUBLE, // aligned long or double 1010 NONSTATIC_OOP, 1011 NONSTATIC_BYTE, 1012 NONSTATIC_SHORT, 1013 NONSTATIC_WORD, 1014 NONSTATIC_DOUBLE, 1015 MAX_FIELD_ALLOCATION_TYPE, 1016 BAD_ALLOCATION_TYPE = -1 1017 }; 1018 1019 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1020 BAD_ALLOCATION_TYPE, // 0 1021 BAD_ALLOCATION_TYPE, // 1 1022 BAD_ALLOCATION_TYPE, // 2 1023 BAD_ALLOCATION_TYPE, // 3 1024 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1025 NONSTATIC_SHORT, // T_CHAR = 5, 1026 NONSTATIC_WORD, // T_FLOAT = 6, 1027 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1028 NONSTATIC_BYTE, // T_BYTE = 8, 1029 NONSTATIC_SHORT, // T_SHORT = 9, 1030 NONSTATIC_WORD, // T_INT = 10, 1031 NONSTATIC_DOUBLE, // T_LONG = 11, 1032 NONSTATIC_OOP, // T_OBJECT = 12, 1033 NONSTATIC_OOP, // T_ARRAY = 13, 1034 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1035 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1036 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1037 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1038 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1039 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1040 BAD_ALLOCATION_TYPE, // 0 1041 BAD_ALLOCATION_TYPE, // 1 1042 BAD_ALLOCATION_TYPE, // 2 1043 BAD_ALLOCATION_TYPE, // 3 1044 STATIC_BYTE , // T_BOOLEAN = 4, 1045 STATIC_SHORT, // T_CHAR = 5, 1046 STATIC_WORD, // T_FLOAT = 6, 1047 STATIC_DOUBLE, // T_DOUBLE = 7, 1048 STATIC_BYTE, // T_BYTE = 8, 1049 STATIC_SHORT, // T_SHORT = 9, 1050 STATIC_WORD, // T_INT = 10, 1051 STATIC_DOUBLE, // T_LONG = 11, 1052 STATIC_OOP, // T_OBJECT = 12, 1053 STATIC_OOP, // T_ARRAY = 13, 1054 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1055 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1056 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1057 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1058 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1059 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1060 }; 1061 1062 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1063 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1064 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1065 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1066 return result; 1067 } 1068 1069 class FieldAllocationCount: public ResourceObj { 1070 public: 1071 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1072 1073 FieldAllocationCount() { 1074 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1075 count[i] = 0; 1076 } 1077 } 1078 1079 FieldAllocationType update(bool is_static, BasicType type) { 1080 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1081 // Make sure there is no overflow with injected fields. 1082 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1083 count[atype]++; 1084 return atype; 1085 } 1086 }; 1087 1088 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1089 bool is_interface, 1090 FieldAllocationCount *fac, 1091 u2* java_fields_count_ptr, TRAPS) { 1092 ClassFileStream* cfs = stream(); 1093 cfs->guarantee_more(2, CHECK_NULL); // length 1094 u2 length = cfs->get_u2_fast(); 1095 *java_fields_count_ptr = length; 1096 1097 int num_injected = 0; 1098 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1099 int total_fields = length + num_injected; 1100 1101 // The field array starts with tuples of shorts 1102 // [access, name index, sig index, initial value index, byte offset]. 1103 // A generic signature slot only exists for field with generic 1104 // signature attribute. And the access flag is set with 1105 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1106 // signature slots are at the end of the field array and after all 1107 // other fields data. 1108 // 1109 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1110 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1111 // ... 1112 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1113 // [generic signature index] 1114 // [generic signature index] 1115 // ... 1116 // 1117 // Allocate a temporary resource array for field data. For each field, 1118 // a slot is reserved in the temporary array for the generic signature 1119 // index. After parsing all fields, the data are copied to a permanent 1120 // array and any unused slots will be discarded. 1121 ResourceMark rm(THREAD); 1122 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1123 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1124 1125 // The generic signature slots start after all other fields' data. 1126 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1127 int num_generic_signature = 0; 1128 for (int n = 0; n < length; n++) { 1129 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1130 1131 AccessFlags access_flags; 1132 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1133 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1134 access_flags.set_flags(flags); 1135 1136 u2 name_index = cfs->get_u2_fast(); 1137 int cp_size = _cp->length(); 1138 check_property(valid_symbol_at(name_index), 1139 "Invalid constant pool index %u for field name in class file %s", 1140 name_index, 1141 CHECK_NULL); 1142 Symbol* name = _cp->symbol_at(name_index); 1143 verify_legal_field_name(name, CHECK_NULL); 1144 1145 u2 signature_index = cfs->get_u2_fast(); 1146 check_property(valid_symbol_at(signature_index), 1147 "Invalid constant pool index %u for field signature in class file %s", 1148 signature_index, CHECK_NULL); 1149 Symbol* sig = _cp->symbol_at(signature_index); 1150 verify_legal_field_signature(name, sig, CHECK_NULL); 1151 1152 u2 constantvalue_index = 0; 1153 bool is_synthetic = false; 1154 u2 generic_signature_index = 0; 1155 bool is_static = access_flags.is_static(); 1156 FieldAnnotationCollector parsed_annotations(_loader_data); 1157 1158 u2 attributes_count = cfs->get_u2_fast(); 1159 if (attributes_count > 0) { 1160 parse_field_attributes(attributes_count, is_static, signature_index, 1161 &constantvalue_index, &is_synthetic, 1162 &generic_signature_index, &parsed_annotations, 1163 CHECK_NULL); 1164 if (parsed_annotations.field_annotations() != NULL) { 1165 if (_fields_annotations == NULL) { 1166 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1167 _loader_data, length, NULL, 1168 CHECK_NULL); 1169 } 1170 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1171 parsed_annotations.set_field_annotations(NULL); 1172 } 1173 if (parsed_annotations.field_type_annotations() != NULL) { 1174 if (_fields_type_annotations == NULL) { 1175 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1176 _loader_data, length, NULL, 1177 CHECK_NULL); 1178 } 1179 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1180 parsed_annotations.set_field_type_annotations(NULL); 1181 } 1182 1183 if (is_synthetic) { 1184 access_flags.set_is_synthetic(); 1185 } 1186 if (generic_signature_index != 0) { 1187 access_flags.set_field_has_generic_signature(); 1188 fa[generic_signature_slot] = generic_signature_index; 1189 generic_signature_slot ++; 1190 num_generic_signature ++; 1191 } 1192 } 1193 1194 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1195 field->initialize(access_flags.as_short(), 1196 name_index, 1197 signature_index, 1198 constantvalue_index); 1199 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1200 1201 // Remember how many oops we encountered and compute allocation type 1202 FieldAllocationType atype = fac->update(is_static, type); 1203 field->set_allocation_type(atype); 1204 1205 // After field is initialized with type, we can augment it with aux info 1206 if (parsed_annotations.has_any_annotations()) 1207 parsed_annotations.apply_to(field); 1208 } 1209 1210 int index = length; 1211 if (num_injected != 0) { 1212 for (int n = 0; n < num_injected; n++) { 1213 // Check for duplicates 1214 if (injected[n].may_be_java) { 1215 Symbol* name = injected[n].name(); 1216 Symbol* signature = injected[n].signature(); 1217 bool duplicate = false; 1218 for (int i = 0; i < length; i++) { 1219 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1220 if (name == _cp->symbol_at(f->name_index()) && 1221 signature == _cp->symbol_at(f->signature_index())) { 1222 // Symbol is desclared in Java so skip this one 1223 duplicate = true; 1224 break; 1225 } 1226 } 1227 if (duplicate) { 1228 // These will be removed from the field array at the end 1229 continue; 1230 } 1231 } 1232 1233 // Injected field 1234 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1235 field->initialize(JVM_ACC_FIELD_INTERNAL, 1236 injected[n].name_index, 1237 injected[n].signature_index, 1238 0); 1239 1240 BasicType type = FieldType::basic_type(injected[n].signature()); 1241 1242 // Remember how many oops we encountered and compute allocation type 1243 FieldAllocationType atype = fac->update(false, type); 1244 field->set_allocation_type(atype); 1245 index++; 1246 } 1247 } 1248 1249 // Now copy the fields' data from the temporary resource array. 1250 // Sometimes injected fields already exist in the Java source so 1251 // the fields array could be too long. In that case the 1252 // fields array is trimed. Also unused slots that were reserved 1253 // for generic signature indexes are discarded. 1254 Array<u2>* fields = MetadataFactory::new_array<u2>( 1255 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1256 CHECK_NULL); 1257 _fields = fields; // save in case of error 1258 { 1259 int i = 0; 1260 for (; i < index * FieldInfo::field_slots; i++) { 1261 fields->at_put(i, fa[i]); 1262 } 1263 for (int j = total_fields * FieldInfo::field_slots; 1264 j < generic_signature_slot; j++) { 1265 fields->at_put(i++, fa[j]); 1266 } 1267 assert(i == fields->length(), ""); 1268 } 1269 1270 if (_need_verify && length > 1) { 1271 // Check duplicated fields 1272 ResourceMark rm(THREAD); 1273 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1274 THREAD, NameSigHash*, HASH_ROW_SIZE); 1275 initialize_hashtable(names_and_sigs); 1276 bool dup = false; 1277 { 1278 debug_only(No_Safepoint_Verifier nsv;) 1279 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1280 Symbol* name = fs.name(); 1281 Symbol* sig = fs.signature(); 1282 // If no duplicates, add name/signature in hashtable names_and_sigs. 1283 if (!put_after_lookup(name, sig, names_and_sigs)) { 1284 dup = true; 1285 break; 1286 } 1287 } 1288 } 1289 if (dup) { 1290 classfile_parse_error("Duplicate field name&signature in class file %s", 1291 CHECK_NULL); 1292 } 1293 } 1294 1295 return fields; 1296 } 1297 1298 1299 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1300 while (length-- > 0) { 1301 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1302 } 1303 } 1304 1305 1306 u2* ClassFileParser::parse_exception_table(u4 code_length, 1307 u4 exception_table_length, 1308 TRAPS) { 1309 ClassFileStream* cfs = stream(); 1310 1311 u2* exception_table_start = cfs->get_u2_buffer(); 1312 assert(exception_table_start != NULL, "null exception table"); 1313 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1314 // Will check legal target after parsing code array in verifier. 1315 if (_need_verify) { 1316 for (unsigned int i = 0; i < exception_table_length; i++) { 1317 u2 start_pc = cfs->get_u2_fast(); 1318 u2 end_pc = cfs->get_u2_fast(); 1319 u2 handler_pc = cfs->get_u2_fast(); 1320 u2 catch_type_index = cfs->get_u2_fast(); 1321 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1322 "Illegal exception table range in class file %s", 1323 CHECK_NULL); 1324 guarantee_property(handler_pc < code_length, 1325 "Illegal exception table handler in class file %s", 1326 CHECK_NULL); 1327 if (catch_type_index != 0) { 1328 guarantee_property(valid_klass_reference_at(catch_type_index), 1329 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1330 } 1331 } 1332 } else { 1333 cfs->skip_u2_fast(exception_table_length * 4); 1334 } 1335 return exception_table_start; 1336 } 1337 1338 void ClassFileParser::parse_linenumber_table( 1339 u4 code_attribute_length, u4 code_length, 1340 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1341 ClassFileStream* cfs = stream(); 1342 unsigned int num_entries = cfs->get_u2(CHECK); 1343 1344 // Each entry is a u2 start_pc, and a u2 line_number 1345 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1346 1347 // Verify line number attribute and table length 1348 check_property( 1349 code_attribute_length == sizeof(u2) + length_in_bytes, 1350 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1351 1352 cfs->guarantee_more(length_in_bytes, CHECK); 1353 1354 if ((*write_stream) == NULL) { 1355 if (length_in_bytes > fixed_buffer_size) { 1356 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1357 } else { 1358 (*write_stream) = new CompressedLineNumberWriteStream( 1359 linenumbertable_buffer, fixed_buffer_size); 1360 } 1361 } 1362 1363 while (num_entries-- > 0) { 1364 u2 bci = cfs->get_u2_fast(); // start_pc 1365 u2 line = cfs->get_u2_fast(); // line_number 1366 guarantee_property(bci < code_length, 1367 "Invalid pc in LineNumberTable in class file %s", CHECK); 1368 (*write_stream)->write_pair(bci, line); 1369 } 1370 } 1371 1372 1373 // Class file LocalVariableTable elements. 1374 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1375 public: 1376 u2 start_bci; 1377 u2 length; 1378 u2 name_cp_index; 1379 u2 descriptor_cp_index; 1380 u2 slot; 1381 }; 1382 1383 1384 class LVT_Hash: public CHeapObj<mtClass> { 1385 public: 1386 LocalVariableTableElement *_elem; // element 1387 LVT_Hash* _next; // Next entry in hash table 1388 }; 1389 1390 unsigned int hash(LocalVariableTableElement *elem) { 1391 unsigned int raw_hash = elem->start_bci; 1392 1393 raw_hash = elem->length + raw_hash * 37; 1394 raw_hash = elem->name_cp_index + raw_hash * 37; 1395 raw_hash = elem->slot + raw_hash * 37; 1396 1397 return raw_hash % HASH_ROW_SIZE; 1398 } 1399 1400 void initialize_hashtable(LVT_Hash** table) { 1401 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1402 table[i] = NULL; 1403 } 1404 } 1405 1406 void clear_hashtable(LVT_Hash** table) { 1407 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1408 LVT_Hash* current = table[i]; 1409 LVT_Hash* next; 1410 while (current != NULL) { 1411 next = current->_next; 1412 current->_next = NULL; 1413 delete(current); 1414 current = next; 1415 } 1416 table[i] = NULL; 1417 } 1418 } 1419 1420 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1421 LVT_Hash* entry = table[index]; 1422 1423 /* 1424 * 3-tuple start_bci/length/slot has to be unique key, 1425 * so the following comparison seems to be redundant: 1426 * && elem->name_cp_index == entry->_elem->name_cp_index 1427 */ 1428 while (entry != NULL) { 1429 if (elem->start_bci == entry->_elem->start_bci 1430 && elem->length == entry->_elem->length 1431 && elem->name_cp_index == entry->_elem->name_cp_index 1432 && elem->slot == entry->_elem->slot 1433 ) { 1434 return entry; 1435 } 1436 entry = entry->_next; 1437 } 1438 return NULL; 1439 } 1440 1441 // Return false if the local variable is found in table. 1442 // Return true if no duplicate is found. 1443 // And local variable is added as a new entry in table. 1444 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1445 // First lookup for duplicates 1446 int index = hash(elem); 1447 LVT_Hash* entry = LVT_lookup(elem, index, table); 1448 1449 if (entry != NULL) { 1450 return false; 1451 } 1452 // No duplicate is found, allocate a new entry and fill it. 1453 if ((entry = new LVT_Hash()) == NULL) { 1454 return false; 1455 } 1456 entry->_elem = elem; 1457 1458 // Insert into hash table 1459 entry->_next = table[index]; 1460 table[index] = entry; 1461 1462 return true; 1463 } 1464 1465 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1466 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1467 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1468 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1469 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1470 lvt->signature_cp_index = 0; 1471 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1472 } 1473 1474 // Function is used to parse both attributes: 1475 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1476 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1477 u2 max_locals, 1478 u4 code_attribute_length, 1479 u2* localvariable_table_length, 1480 bool isLVTT, 1481 TRAPS) { 1482 ClassFileStream* cfs = stream(); 1483 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1484 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1485 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1486 // Verify local variable table attribute has right length 1487 if (_need_verify) { 1488 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1489 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1490 } 1491 u2* localvariable_table_start = cfs->get_u2_buffer(); 1492 assert(localvariable_table_start != NULL, "null local variable table"); 1493 if (!_need_verify) { 1494 cfs->skip_u2_fast(size); 1495 } else { 1496 cfs->guarantee_more(size * 2, CHECK_NULL); 1497 for(int i = 0; i < (*localvariable_table_length); i++) { 1498 u2 start_pc = cfs->get_u2_fast(); 1499 u2 length = cfs->get_u2_fast(); 1500 u2 name_index = cfs->get_u2_fast(); 1501 u2 descriptor_index = cfs->get_u2_fast(); 1502 u2 index = cfs->get_u2_fast(); 1503 // Assign to a u4 to avoid overflow 1504 u4 end_pc = (u4)start_pc + (u4)length; 1505 1506 if (start_pc >= code_length) { 1507 classfile_parse_error( 1508 "Invalid start_pc %u in %s in class file %s", 1509 start_pc, tbl_name, CHECK_NULL); 1510 } 1511 if (end_pc > code_length) { 1512 classfile_parse_error( 1513 "Invalid length %u in %s in class file %s", 1514 length, tbl_name, CHECK_NULL); 1515 } 1516 int cp_size = _cp->length(); 1517 guarantee_property(valid_symbol_at(name_index), 1518 "Name index %u in %s has bad constant type in class file %s", 1519 name_index, tbl_name, CHECK_NULL); 1520 guarantee_property(valid_symbol_at(descriptor_index), 1521 "Signature index %u in %s has bad constant type in class file %s", 1522 descriptor_index, tbl_name, CHECK_NULL); 1523 1524 Symbol* name = _cp->symbol_at(name_index); 1525 Symbol* sig = _cp->symbol_at(descriptor_index); 1526 verify_legal_field_name(name, CHECK_NULL); 1527 u2 extra_slot = 0; 1528 if (!isLVTT) { 1529 verify_legal_field_signature(name, sig, CHECK_NULL); 1530 1531 // 4894874: check special cases for double and long local variables 1532 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1533 sig == vmSymbols::type_signature(T_LONG)) { 1534 extra_slot = 1; 1535 } 1536 } 1537 guarantee_property((index + extra_slot) < max_locals, 1538 "Invalid index %u in %s in class file %s", 1539 index, tbl_name, CHECK_NULL); 1540 } 1541 } 1542 return localvariable_table_start; 1543 } 1544 1545 1546 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1547 u1* u1_array, u2* u2_array, TRAPS) { 1548 ClassFileStream* cfs = stream(); 1549 u2 index = 0; // index in the array with long/double occupying two slots 1550 u4 i1 = *u1_index; 1551 u4 i2 = *u2_index + 1; 1552 for(int i = 0; i < array_length; i++) { 1553 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1554 index++; 1555 if (tag == ITEM_Long || tag == ITEM_Double) { 1556 index++; 1557 } else if (tag == ITEM_Object) { 1558 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1559 guarantee_property(valid_klass_reference_at(class_index), 1560 "Bad class index %u in StackMap in class file %s", 1561 class_index, CHECK); 1562 } else if (tag == ITEM_Uninitialized) { 1563 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1564 guarantee_property( 1565 offset < code_length, 1566 "Bad uninitialized type offset %u in StackMap in class file %s", 1567 offset, CHECK); 1568 } else { 1569 guarantee_property( 1570 tag <= (u1)ITEM_Uninitialized, 1571 "Unknown variable type %u in StackMap in class file %s", 1572 tag, CHECK); 1573 } 1574 } 1575 u2_array[*u2_index] = index; 1576 *u1_index = i1; 1577 *u2_index = i2; 1578 } 1579 1580 u1* ClassFileParser::parse_stackmap_table( 1581 u4 code_attribute_length, TRAPS) { 1582 if (code_attribute_length == 0) 1583 return NULL; 1584 1585 ClassFileStream* cfs = stream(); 1586 u1* stackmap_table_start = cfs->get_u1_buffer(); 1587 assert(stackmap_table_start != NULL, "null stackmap table"); 1588 1589 // check code_attribute_length first 1590 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1591 1592 if (!_need_verify && !DumpSharedSpaces) { 1593 return NULL; 1594 } 1595 return stackmap_table_start; 1596 } 1597 1598 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1599 u4 method_attribute_length, 1600 TRAPS) { 1601 ClassFileStream* cfs = stream(); 1602 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1603 *checked_exceptions_length = cfs->get_u2_fast(); 1604 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1605 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1606 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1607 if (!_need_verify) { 1608 cfs->skip_u2_fast(size); 1609 } else { 1610 // Verify each value in the checked exception table 1611 u2 checked_exception; 1612 u2 len = *checked_exceptions_length; 1613 cfs->guarantee_more(2 * len, CHECK_NULL); 1614 for (int i = 0; i < len; i++) { 1615 checked_exception = cfs->get_u2_fast(); 1616 check_property( 1617 valid_klass_reference_at(checked_exception), 1618 "Exception name has bad type at constant pool %u in class file %s", 1619 checked_exception, CHECK_NULL); 1620 } 1621 } 1622 // check exceptions attribute length 1623 if (_need_verify) { 1624 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1625 sizeof(u2) * size), 1626 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1627 } 1628 return checked_exceptions_start; 1629 } 1630 1631 void ClassFileParser::throwIllegalSignature( 1632 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1633 ResourceMark rm(THREAD); 1634 Exceptions::fthrow(THREAD_AND_LOCATION, 1635 vmSymbols::java_lang_ClassFormatError(), 1636 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1637 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1638 } 1639 1640 // Skip an annotation. Return >=limit if there is any problem. 1641 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1642 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1643 // value := switch (tag:u1) { ... } 1644 index += 2; // skip atype 1645 if ((index += 2) >= limit) return limit; // read nmem 1646 int nmem = Bytes::get_Java_u2(buffer+index-2); 1647 while (--nmem >= 0 && index < limit) { 1648 index += 2; // skip member 1649 index = skip_annotation_value(buffer, limit, index); 1650 } 1651 return index; 1652 } 1653 1654 // Skip an annotation value. Return >=limit if there is any problem. 1655 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1656 // value := switch (tag:u1) { 1657 // case B, C, I, S, Z, D, F, J, c: con:u2; 1658 // case e: e_class:u2 e_name:u2; 1659 // case s: s_con:u2; 1660 // case [: do(nval:u2) {value}; 1661 // case @: annotation; 1662 // case s: s_con:u2; 1663 // } 1664 if ((index += 1) >= limit) return limit; // read tag 1665 u1 tag = buffer[index-1]; 1666 switch (tag) { 1667 case 'B': case 'C': case 'I': case 'S': case 'Z': 1668 case 'D': case 'F': case 'J': case 'c': case 's': 1669 index += 2; // skip con or s_con 1670 break; 1671 case 'e': 1672 index += 4; // skip e_class, e_name 1673 break; 1674 case '[': 1675 { 1676 if ((index += 2) >= limit) return limit; // read nval 1677 int nval = Bytes::get_Java_u2(buffer+index-2); 1678 while (--nval >= 0 && index < limit) { 1679 index = skip_annotation_value(buffer, limit, index); 1680 } 1681 } 1682 break; 1683 case '@': 1684 index = skip_annotation(buffer, limit, index); 1685 break; 1686 default: 1687 assert(false, "annotation tag"); 1688 return limit; // bad tag byte 1689 } 1690 return index; 1691 } 1692 1693 // Sift through annotations, looking for those significant to the VM: 1694 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1695 ClassFileParser::AnnotationCollector* coll, 1696 TRAPS) { 1697 // annotations := do(nann:u2) {annotation} 1698 int index = 0; 1699 if ((index += 2) >= limit) return; // read nann 1700 int nann = Bytes::get_Java_u2(buffer+index-2); 1701 enum { // initial annotation layout 1702 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1703 count_off = 2, // u2 such as 1 (one value) 1704 member_off = 4, // utf8 such as 'value' 1705 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1706 e_tag_val = 'e', 1707 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1708 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1709 e_size = 11, // end of 'e' annotation 1710 c_tag_val = 'c', // payload is type 1711 c_con_off = 7, // utf8 payload, such as 'I' 1712 c_size = 9, // end of 'c' annotation 1713 s_tag_val = 's', // payload is String 1714 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1715 s_size = 9, 1716 min_size = 6 // smallest possible size (zero members) 1717 }; 1718 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1719 int index0 = index; 1720 index = skip_annotation(buffer, limit, index); 1721 u1* abase = buffer + index0; 1722 int atype = Bytes::get_Java_u2(abase + atype_off); 1723 int count = Bytes::get_Java_u2(abase + count_off); 1724 Symbol* aname = check_symbol_at(_cp, atype); 1725 if (aname == NULL) break; // invalid annotation name 1726 Symbol* member = NULL; 1727 if (count >= 1) { 1728 int member_index = Bytes::get_Java_u2(abase + member_off); 1729 member = check_symbol_at(_cp, member_index); 1730 if (member == NULL) break; // invalid member name 1731 } 1732 1733 // Here is where parsing particular annotations will take place. 1734 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1735 if (id == AnnotationCollector::_unknown) continue; 1736 coll->set_annotation(id); 1737 1738 if (id == AnnotationCollector::_sun_misc_Contended) { 1739 // @Contended can optionally specify the contention group. 1740 // 1741 // Contended group defines the equivalence class over the fields: 1742 // the fields within the same contended group are not treated distinct. 1743 // The only exception is default group, which does not incur the 1744 // equivalence. Naturally, contention group for classes is meaningless. 1745 // 1746 // While the contention group is specified as String, annotation 1747 // values are already interned, and we might as well use the constant 1748 // pool index as the group tag. 1749 // 1750 u2 group_index = 0; // default contended group 1751 if (count == 1 1752 && s_size == (index - index0) // match size 1753 && s_tag_val == *(abase + tag_off) 1754 && member == vmSymbols::value_name()) { 1755 group_index = Bytes::get_Java_u2(abase + s_con_off); 1756 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1757 group_index = 0; // default contended group 1758 } 1759 } 1760 coll->set_contended_group(group_index); 1761 } 1762 } 1763 } 1764 1765 ClassFileParser::AnnotationCollector::ID 1766 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1767 Symbol* name) { 1768 vmSymbols::SID sid = vmSymbols::find_sid(name); 1769 // Privileged code can use all annotations. Other code silently drops some. 1770 const bool privileged = loader_data->is_the_null_class_loader_data() || 1771 loader_data->is_ext_class_loader_data() || 1772 loader_data->is_anonymous(); 1773 switch (sid) { 1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1775 if (_location != _in_method) break; // only allow for methods 1776 if (!privileged) break; // only allow in privileged code 1777 return _method_CallerSensitive; 1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1779 if (_location != _in_method) break; // only allow for methods 1780 if (!privileged) break; // only allow in privileged code 1781 return _method_ForceInline; 1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1783 if (_location != _in_method) break; // only allow for methods 1784 if (!privileged) break; // only allow in privileged code 1785 return _method_DontInline; 1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1787 if (_location != _in_method) break; // only allow for methods 1788 if (!privileged) break; // only allow in privileged code 1789 return _method_LambdaForm_Compiled; 1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1791 if (_location != _in_method) break; // only allow for methods 1792 if (!privileged) break; // only allow in privileged code 1793 return _method_LambdaForm_Hidden; 1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1795 if (_location != _in_field) break; // only allow for fields 1796 if (!privileged) break; // only allow in privileged code 1797 return _field_Stable; 1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1799 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1800 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1801 return _sun_misc_Contended; 1802 default: break; 1803 } 1804 return AnnotationCollector::_unknown; 1805 } 1806 1807 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1808 if (is_contended()) 1809 f->set_contended_group(contended_group()); 1810 if (is_stable()) 1811 f->set_stable(true); 1812 } 1813 1814 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1815 // If there's an error deallocate metadata for field annotations 1816 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1817 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1818 } 1819 1820 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1821 if (has_annotation(_method_CallerSensitive)) 1822 m->set_caller_sensitive(true); 1823 if (has_annotation(_method_ForceInline)) 1824 m->set_force_inline(true); 1825 if (has_annotation(_method_DontInline)) 1826 m->set_dont_inline(true); 1827 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1828 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1829 if (has_annotation(_method_LambdaForm_Hidden)) 1830 m->set_hidden(true); 1831 } 1832 1833 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1834 k->set_is_contended(is_contended()); 1835 } 1836 1837 1838 #define MAX_ARGS_SIZE 255 1839 #define MAX_CODE_SIZE 65535 1840 #define INITIAL_MAX_LVT_NUMBER 256 1841 1842 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1843 * 1844 * Rules for LVT's and LVTT's are: 1845 * - There can be any number of LVT's and LVTT's. 1846 * - If there are n LVT's, it is the same as if there was just 1847 * one LVT containing all the entries from the n LVT's. 1848 * - There may be no more than one LVT entry per local variable. 1849 * Two LVT entries are 'equal' if these fields are the same: 1850 * start_pc, length, name, slot 1851 * - There may be no more than one LVTT entry per each LVT entry. 1852 * Each LVTT entry has to match some LVT entry. 1853 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1854 */ 1855 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1856 int lvt_cnt, 1857 u2* localvariable_table_length, 1858 u2** localvariable_table_start, 1859 int lvtt_cnt, 1860 u2* localvariable_type_table_length, 1861 u2** localvariable_type_table_start, 1862 TRAPS) { 1863 1864 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1865 initialize_hashtable(lvt_Hash); 1866 1867 // To fill LocalVariableTable in 1868 Classfile_LVT_Element* cf_lvt; 1869 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1870 1871 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1872 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1873 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1874 copy_lvt_element(&cf_lvt[idx], lvt); 1875 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1876 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1877 && _need_verify 1878 && _major_version >= JAVA_1_5_VERSION) { 1879 clear_hashtable(lvt_Hash); 1880 classfile_parse_error("Duplicated LocalVariableTable attribute " 1881 "entry for '%s' in class file %s", 1882 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1883 CHECK); 1884 } 1885 } 1886 } 1887 1888 // To merge LocalVariableTable and LocalVariableTypeTable 1889 Classfile_LVT_Element* cf_lvtt; 1890 LocalVariableTableElement lvtt_elem; 1891 1892 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1893 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1894 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1895 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1896 int index = hash(&lvtt_elem); 1897 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1898 if (entry == NULL) { 1899 if (_need_verify) { 1900 clear_hashtable(lvt_Hash); 1901 classfile_parse_error("LVTT entry for '%s' in class file %s " 1902 "does not match any LVT entry", 1903 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1904 CHECK); 1905 } 1906 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1907 clear_hashtable(lvt_Hash); 1908 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1909 "entry for '%s' in class file %s", 1910 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1911 CHECK); 1912 } else { 1913 // to add generic signatures into LocalVariableTable 1914 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1915 } 1916 } 1917 } 1918 clear_hashtable(lvt_Hash); 1919 } 1920 1921 1922 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1923 u1* runtime_visible_annotations, 1924 int runtime_visible_annotations_length, 1925 u1* runtime_invisible_annotations, 1926 int runtime_invisible_annotations_length, 1927 u1* runtime_visible_parameter_annotations, 1928 int runtime_visible_parameter_annotations_length, 1929 u1* runtime_invisible_parameter_annotations, 1930 int runtime_invisible_parameter_annotations_length, 1931 u1* runtime_visible_type_annotations, 1932 int runtime_visible_type_annotations_length, 1933 u1* runtime_invisible_type_annotations, 1934 int runtime_invisible_type_annotations_length, 1935 u1* annotation_default, 1936 int annotation_default_length, 1937 TRAPS) { 1938 1939 AnnotationArray* a; 1940 1941 if (runtime_visible_annotations_length + 1942 runtime_invisible_annotations_length > 0) { 1943 a = assemble_annotations(runtime_visible_annotations, 1944 runtime_visible_annotations_length, 1945 runtime_invisible_annotations, 1946 runtime_invisible_annotations_length, 1947 CHECK); 1948 cm->set_method_annotations(a); 1949 } 1950 1951 if (runtime_visible_parameter_annotations_length + 1952 runtime_invisible_parameter_annotations_length > 0) { 1953 a = assemble_annotations(runtime_visible_parameter_annotations, 1954 runtime_visible_parameter_annotations_length, 1955 runtime_invisible_parameter_annotations, 1956 runtime_invisible_parameter_annotations_length, 1957 CHECK); 1958 cm->set_parameter_annotations(a); 1959 } 1960 1961 if (annotation_default_length > 0) { 1962 a = assemble_annotations(annotation_default, 1963 annotation_default_length, 1964 NULL, 1965 0, 1966 CHECK); 1967 cm->set_default_annotations(a); 1968 } 1969 1970 if (runtime_visible_type_annotations_length + 1971 runtime_invisible_type_annotations_length > 0) { 1972 a = assemble_annotations(runtime_visible_type_annotations, 1973 runtime_visible_type_annotations_length, 1974 runtime_invisible_type_annotations, 1975 runtime_invisible_type_annotations_length, 1976 CHECK); 1977 cm->set_type_annotations(a); 1978 } 1979 } 1980 1981 1982 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1983 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1984 // Method* to save footprint, so we only know the size of the resulting Method* when the 1985 // entire method attribute is parsed. 1986 // 1987 // The promoted_flags parameter is used to pass relevant access_flags 1988 // from the method back up to the containing klass. These flag values 1989 // are added to klass's access_flags. 1990 1991 methodHandle ClassFileParser::parse_method(bool is_interface, 1992 AccessFlags *promoted_flags, 1993 TRAPS) { 1994 ClassFileStream* cfs = stream(); 1995 methodHandle nullHandle; 1996 ResourceMark rm(THREAD); 1997 // Parse fixed parts 1998 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1999 2000 int flags = cfs->get_u2_fast(); 2001 u2 name_index = cfs->get_u2_fast(); 2002 int cp_size = _cp->length(); 2003 check_property( 2004 valid_symbol_at(name_index), 2005 "Illegal constant pool index %u for method name in class file %s", 2006 name_index, CHECK_(nullHandle)); 2007 Symbol* name = _cp->symbol_at(name_index); 2008 verify_legal_method_name(name, CHECK_(nullHandle)); 2009 2010 u2 signature_index = cfs->get_u2_fast(); 2011 guarantee_property( 2012 valid_symbol_at(signature_index), 2013 "Illegal constant pool index %u for method signature in class file %s", 2014 signature_index, CHECK_(nullHandle)); 2015 Symbol* signature = _cp->symbol_at(signature_index); 2016 2017 AccessFlags access_flags; 2018 if (name == vmSymbols::class_initializer_name()) { 2019 // We ignore the other access flags for a valid class initializer. 2020 // (JVM Spec 2nd ed., chapter 4.6) 2021 if (_major_version < 51) { // backward compatibility 2022 flags = JVM_ACC_STATIC; 2023 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2024 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2025 } 2026 } else { 2027 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2028 } 2029 2030 int args_size = -1; // only used when _need_verify is true 2031 if (_need_verify) { 2032 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2033 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2034 if (args_size > MAX_ARGS_SIZE) { 2035 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2036 } 2037 } 2038 2039 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2040 2041 // Default values for code and exceptions attribute elements 2042 u2 max_stack = 0; 2043 u2 max_locals = 0; 2044 u4 code_length = 0; 2045 u1* code_start = 0; 2046 u2 exception_table_length = 0; 2047 u2* exception_table_start = NULL; 2048 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2049 u2 checked_exceptions_length = 0; 2050 u2* checked_exceptions_start = NULL; 2051 CompressedLineNumberWriteStream* linenumber_table = NULL; 2052 int linenumber_table_length = 0; 2053 int total_lvt_length = 0; 2054 u2 lvt_cnt = 0; 2055 u2 lvtt_cnt = 0; 2056 bool lvt_allocated = false; 2057 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2058 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2059 u2* localvariable_table_length; 2060 u2** localvariable_table_start; 2061 u2* localvariable_type_table_length; 2062 u2** localvariable_type_table_start; 2063 int method_parameters_length = -1; 2064 u1* method_parameters_data = NULL; 2065 bool method_parameters_seen = false; 2066 bool parsed_code_attribute = false; 2067 bool parsed_checked_exceptions_attribute = false; 2068 bool parsed_stackmap_attribute = false; 2069 // stackmap attribute - JDK1.5 2070 u1* stackmap_data = NULL; 2071 int stackmap_data_length = 0; 2072 u2 generic_signature_index = 0; 2073 MethodAnnotationCollector parsed_annotations; 2074 u1* runtime_visible_annotations = NULL; 2075 int runtime_visible_annotations_length = 0; 2076 u1* runtime_invisible_annotations = NULL; 2077 int runtime_invisible_annotations_length = 0; 2078 u1* runtime_visible_parameter_annotations = NULL; 2079 int runtime_visible_parameter_annotations_length = 0; 2080 u1* runtime_invisible_parameter_annotations = NULL; 2081 int runtime_invisible_parameter_annotations_length = 0; 2082 u1* runtime_visible_type_annotations = NULL; 2083 int runtime_visible_type_annotations_length = 0; 2084 u1* runtime_invisible_type_annotations = NULL; 2085 int runtime_invisible_type_annotations_length = 0; 2086 bool runtime_invisible_annotations_exists = false; 2087 bool runtime_invisible_type_annotations_exists = false; 2088 bool runtime_invisible_parameter_annotations_exists = false; 2089 u1* annotation_default = NULL; 2090 int annotation_default_length = 0; 2091 2092 // Parse code and exceptions attribute 2093 u2 method_attributes_count = cfs->get_u2_fast(); 2094 while (method_attributes_count--) { 2095 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2096 u2 method_attribute_name_index = cfs->get_u2_fast(); 2097 u4 method_attribute_length = cfs->get_u4_fast(); 2098 check_property( 2099 valid_symbol_at(method_attribute_name_index), 2100 "Invalid method attribute name index %u in class file %s", 2101 method_attribute_name_index, CHECK_(nullHandle)); 2102 2103 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2104 if (method_attribute_name == vmSymbols::tag_code()) { 2105 // Parse Code attribute 2106 if (_need_verify) { 2107 guarantee_property( 2108 !access_flags.is_native() && !access_flags.is_abstract(), 2109 "Code attribute in native or abstract methods in class file %s", 2110 CHECK_(nullHandle)); 2111 } 2112 if (parsed_code_attribute) { 2113 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2114 } 2115 parsed_code_attribute = true; 2116 2117 // Stack size, locals size, and code size 2118 if (_major_version == 45 && _minor_version <= 2) { 2119 cfs->guarantee_more(4, CHECK_(nullHandle)); 2120 max_stack = cfs->get_u1_fast(); 2121 max_locals = cfs->get_u1_fast(); 2122 code_length = cfs->get_u2_fast(); 2123 } else { 2124 cfs->guarantee_more(8, CHECK_(nullHandle)); 2125 max_stack = cfs->get_u2_fast(); 2126 max_locals = cfs->get_u2_fast(); 2127 code_length = cfs->get_u4_fast(); 2128 } 2129 if (_need_verify) { 2130 guarantee_property(args_size <= max_locals, 2131 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2132 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2133 "Invalid method Code length %u in class file %s", 2134 code_length, CHECK_(nullHandle)); 2135 } 2136 // Code pointer 2137 code_start = cfs->get_u1_buffer(); 2138 assert(code_start != NULL, "null code start"); 2139 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2140 cfs->skip_u1_fast(code_length); 2141 2142 // Exception handler table 2143 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2144 exception_table_length = cfs->get_u2_fast(); 2145 if (exception_table_length > 0) { 2146 exception_table_start = 2147 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2148 } 2149 2150 // Parse additional attributes in code attribute 2151 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2152 u2 code_attributes_count = cfs->get_u2_fast(); 2153 2154 unsigned int calculated_attribute_length = 0; 2155 2156 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2157 calculated_attribute_length = 2158 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2159 } else { 2160 // max_stack, locals and length are smaller in pre-version 45.2 classes 2161 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2162 } 2163 calculated_attribute_length += 2164 code_length + 2165 sizeof(exception_table_length) + 2166 sizeof(code_attributes_count) + 2167 exception_table_length * 2168 ( sizeof(u2) + // start_pc 2169 sizeof(u2) + // end_pc 2170 sizeof(u2) + // handler_pc 2171 sizeof(u2) ); // catch_type_index 2172 2173 while (code_attributes_count--) { 2174 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2175 u2 code_attribute_name_index = cfs->get_u2_fast(); 2176 u4 code_attribute_length = cfs->get_u4_fast(); 2177 calculated_attribute_length += code_attribute_length + 2178 sizeof(code_attribute_name_index) + 2179 sizeof(code_attribute_length); 2180 check_property(valid_symbol_at(code_attribute_name_index), 2181 "Invalid code attribute name index %u in class file %s", 2182 code_attribute_name_index, 2183 CHECK_(nullHandle)); 2184 if (LoadLineNumberTables && 2185 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2186 // Parse and compress line number table 2187 parse_linenumber_table(code_attribute_length, code_length, 2188 &linenumber_table, CHECK_(nullHandle)); 2189 2190 } else if (LoadLocalVariableTables && 2191 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2192 // Parse local variable table 2193 if (!lvt_allocated) { 2194 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2195 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2196 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2197 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2198 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2199 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2200 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2201 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2202 lvt_allocated = true; 2203 } 2204 if (lvt_cnt == max_lvt_cnt) { 2205 max_lvt_cnt <<= 1; 2206 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2207 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2208 } 2209 localvariable_table_start[lvt_cnt] = 2210 parse_localvariable_table(code_length, 2211 max_locals, 2212 code_attribute_length, 2213 &localvariable_table_length[lvt_cnt], 2214 false, // is not LVTT 2215 CHECK_(nullHandle)); 2216 total_lvt_length += localvariable_table_length[lvt_cnt]; 2217 lvt_cnt++; 2218 } else if (LoadLocalVariableTypeTables && 2219 _major_version >= JAVA_1_5_VERSION && 2220 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2221 if (!lvt_allocated) { 2222 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2223 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2224 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2225 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2226 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2227 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2228 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2229 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2230 lvt_allocated = true; 2231 } 2232 // Parse local variable type table 2233 if (lvtt_cnt == max_lvtt_cnt) { 2234 max_lvtt_cnt <<= 1; 2235 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2236 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2237 } 2238 localvariable_type_table_start[lvtt_cnt] = 2239 parse_localvariable_table(code_length, 2240 max_locals, 2241 code_attribute_length, 2242 &localvariable_type_table_length[lvtt_cnt], 2243 true, // is LVTT 2244 CHECK_(nullHandle)); 2245 lvtt_cnt++; 2246 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2247 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2248 // Stack map is only needed by the new verifier in JDK1.5. 2249 if (parsed_stackmap_attribute) { 2250 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2251 } 2252 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2253 stackmap_data_length = code_attribute_length; 2254 parsed_stackmap_attribute = true; 2255 } else { 2256 // Skip unknown attributes 2257 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2258 } 2259 } 2260 // check method attribute length 2261 if (_need_verify) { 2262 guarantee_property(method_attribute_length == calculated_attribute_length, 2263 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2264 } 2265 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2266 // Parse Exceptions attribute 2267 if (parsed_checked_exceptions_attribute) { 2268 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2269 } 2270 parsed_checked_exceptions_attribute = true; 2271 checked_exceptions_start = 2272 parse_checked_exceptions(&checked_exceptions_length, 2273 method_attribute_length, 2274 CHECK_(nullHandle)); 2275 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2276 // reject multiple method parameters 2277 if (method_parameters_seen) { 2278 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2279 } 2280 method_parameters_seen = true; 2281 method_parameters_length = cfs->get_u1_fast(); 2282 const u2 real_length = (method_parameters_length * 4u) + 1u; 2283 if (method_attribute_length != real_length) { 2284 classfile_parse_error( 2285 "Invalid MethodParameters method attribute length %u in class file", 2286 method_attribute_length, CHECK_(nullHandle)); 2287 } 2288 method_parameters_data = cfs->get_u1_buffer(); 2289 cfs->skip_u2_fast(method_parameters_length); 2290 cfs->skip_u2_fast(method_parameters_length); 2291 // ignore this attribute if it cannot be reflected 2292 if (!SystemDictionary::Parameter_klass_loaded()) 2293 method_parameters_length = -1; 2294 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2295 if (method_attribute_length != 0) { 2296 classfile_parse_error( 2297 "Invalid Synthetic method attribute length %u in class file %s", 2298 method_attribute_length, CHECK_(nullHandle)); 2299 } 2300 // Should we check that there hasn't already been a synthetic attribute? 2301 access_flags.set_is_synthetic(); 2302 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2303 if (method_attribute_length != 0) { 2304 classfile_parse_error( 2305 "Invalid Deprecated method attribute length %u in class file %s", 2306 method_attribute_length, CHECK_(nullHandle)); 2307 } 2308 } else if (_major_version >= JAVA_1_5_VERSION) { 2309 if (method_attribute_name == vmSymbols::tag_signature()) { 2310 if (method_attribute_length != 2) { 2311 classfile_parse_error( 2312 "Invalid Signature attribute length %u in class file %s", 2313 method_attribute_length, CHECK_(nullHandle)); 2314 } 2315 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2316 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2317 if (runtime_visible_annotations != NULL) { 2318 classfile_parse_error( 2319 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2320 } 2321 runtime_visible_annotations_length = method_attribute_length; 2322 runtime_visible_annotations = cfs->get_u1_buffer(); 2323 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2324 parse_annotations(runtime_visible_annotations, 2325 runtime_visible_annotations_length, &parsed_annotations, 2326 CHECK_(nullHandle)); 2327 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2328 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2329 if (runtime_invisible_annotations_exists) { 2330 classfile_parse_error( 2331 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2332 } 2333 runtime_invisible_annotations_exists = true; 2334 if (PreserveAllAnnotations) { 2335 runtime_invisible_annotations_length = method_attribute_length; 2336 runtime_invisible_annotations = cfs->get_u1_buffer(); 2337 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2338 } 2339 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2340 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2341 if (runtime_visible_parameter_annotations != NULL) { 2342 classfile_parse_error( 2343 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2344 } 2345 runtime_visible_parameter_annotations_length = method_attribute_length; 2346 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2347 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2348 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2349 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2350 if (runtime_invisible_parameter_annotations_exists) { 2351 classfile_parse_error( 2352 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2353 } 2354 runtime_invisible_parameter_annotations_exists = true; 2355 if (PreserveAllAnnotations) { 2356 runtime_invisible_parameter_annotations_length = method_attribute_length; 2357 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2358 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2359 } 2360 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2361 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2362 if (annotation_default != NULL) { 2363 classfile_parse_error( 2364 "Multiple AnnotationDefault attributes for method in class file %s", 2365 CHECK_(nullHandle)); 2366 } 2367 annotation_default_length = method_attribute_length; 2368 annotation_default = cfs->get_u1_buffer(); 2369 assert(annotation_default != NULL, "null annotation default"); 2370 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2371 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2372 if (runtime_visible_type_annotations != NULL) { 2373 classfile_parse_error( 2374 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2375 CHECK_(nullHandle)); 2376 } 2377 runtime_visible_type_annotations_length = method_attribute_length; 2378 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2379 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2380 // No need for the VM to parse Type annotations 2381 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2382 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2383 if (runtime_invisible_type_annotations_exists) { 2384 classfile_parse_error( 2385 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2386 CHECK_(nullHandle)); 2387 } else { 2388 runtime_invisible_type_annotations_exists = true; 2389 } 2390 if (PreserveAllAnnotations) { 2391 runtime_invisible_type_annotations_length = method_attribute_length; 2392 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2393 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2394 } 2395 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2396 } else { 2397 // Skip unknown attributes 2398 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2399 } 2400 } else { 2401 // Skip unknown attributes 2402 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2403 } 2404 } 2405 2406 if (linenumber_table != NULL) { 2407 linenumber_table->write_terminator(); 2408 linenumber_table_length = linenumber_table->position(); 2409 } 2410 2411 // Make sure there's at least one Code attribute in non-native/non-abstract method 2412 if (_need_verify) { 2413 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2414 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2415 } 2416 2417 // All sizing information for a Method* is finally available, now create it 2418 InlineTableSizes sizes( 2419 total_lvt_length, 2420 linenumber_table_length, 2421 exception_table_length, 2422 checked_exceptions_length, 2423 method_parameters_length, 2424 generic_signature_index, 2425 runtime_visible_annotations_length + 2426 runtime_invisible_annotations_length, 2427 runtime_visible_parameter_annotations_length + 2428 runtime_invisible_parameter_annotations_length, 2429 runtime_visible_type_annotations_length + 2430 runtime_invisible_type_annotations_length, 2431 annotation_default_length, 2432 0); 2433 2434 Method* m = Method::allocate( 2435 _loader_data, code_length, access_flags, &sizes, 2436 ConstMethod::NORMAL, CHECK_(nullHandle)); 2437 2438 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2439 2440 // Fill in information from fixed part (access_flags already set) 2441 m->set_constants(_cp); 2442 m->set_name_index(name_index); 2443 m->set_signature_index(signature_index); 2444 #ifdef CC_INTERP 2445 // hmm is there a gc issue here?? 2446 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2447 m->set_result_index(rtf.type()); 2448 #endif 2449 2450 if (args_size >= 0) { 2451 m->set_size_of_parameters(args_size); 2452 } else { 2453 m->compute_size_of_parameters(THREAD); 2454 } 2455 #ifdef ASSERT 2456 if (args_size >= 0) { 2457 m->compute_size_of_parameters(THREAD); 2458 assert(args_size == m->size_of_parameters(), ""); 2459 } 2460 #endif 2461 2462 // Fill in code attribute information 2463 m->set_max_stack(max_stack); 2464 m->set_max_locals(max_locals); 2465 if (stackmap_data != NULL) { 2466 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2467 stackmap_data_length, CHECK_NULL); 2468 } 2469 2470 // Copy byte codes 2471 m->set_code(code_start); 2472 2473 // Copy line number table 2474 if (linenumber_table != NULL) { 2475 memcpy(m->compressed_linenumber_table(), 2476 linenumber_table->buffer(), linenumber_table_length); 2477 } 2478 2479 // Copy exception table 2480 if (exception_table_length > 0) { 2481 int size = 2482 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2483 copy_u2_with_conversion((u2*) m->exception_table_start(), 2484 exception_table_start, size); 2485 } 2486 2487 // Copy method parameters 2488 if (method_parameters_length > 0) { 2489 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2490 for (int i = 0; i < method_parameters_length; i++) { 2491 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2492 method_parameters_data += 2; 2493 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2494 method_parameters_data += 2; 2495 } 2496 } 2497 2498 // Copy checked exceptions 2499 if (checked_exceptions_length > 0) { 2500 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2501 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2502 } 2503 2504 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2505 if (total_lvt_length > 0) { 2506 promoted_flags->set_has_localvariable_table(); 2507 copy_localvariable_table(m->constMethod(), lvt_cnt, 2508 localvariable_table_length, 2509 localvariable_table_start, 2510 lvtt_cnt, 2511 localvariable_type_table_length, 2512 localvariable_type_table_start, CHECK_NULL); 2513 } 2514 2515 if (parsed_annotations.has_any_annotations()) 2516 parsed_annotations.apply_to(m); 2517 2518 // Copy annotations 2519 copy_method_annotations(m->constMethod(), 2520 runtime_visible_annotations, 2521 runtime_visible_annotations_length, 2522 runtime_invisible_annotations, 2523 runtime_invisible_annotations_length, 2524 runtime_visible_parameter_annotations, 2525 runtime_visible_parameter_annotations_length, 2526 runtime_invisible_parameter_annotations, 2527 runtime_invisible_parameter_annotations_length, 2528 runtime_visible_type_annotations, 2529 runtime_visible_type_annotations_length, 2530 runtime_invisible_type_annotations, 2531 runtime_invisible_type_annotations_length, 2532 annotation_default, 2533 annotation_default_length, 2534 CHECK_NULL); 2535 2536 if (name == vmSymbols::finalize_method_name() && 2537 signature == vmSymbols::void_method_signature()) { 2538 if (m->is_empty_method()) { 2539 _has_empty_finalizer = true; 2540 } else { 2541 _has_finalizer = true; 2542 } 2543 } 2544 if (name == vmSymbols::object_initializer_name() && 2545 signature == vmSymbols::void_method_signature() && 2546 m->is_vanilla_constructor()) { 2547 _has_vanilla_constructor = true; 2548 } 2549 2550 NOT_PRODUCT(m->verify()); 2551 return m; 2552 } 2553 2554 2555 // The promoted_flags parameter is used to pass relevant access_flags 2556 // from the methods back up to the containing klass. These flag values 2557 // are added to klass's access_flags. 2558 2559 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2560 AccessFlags* promoted_flags, 2561 bool* has_final_method, 2562 bool* declares_default_methods, 2563 TRAPS) { 2564 ClassFileStream* cfs = stream(); 2565 cfs->guarantee_more(2, CHECK_NULL); // length 2566 u2 length = cfs->get_u2_fast(); 2567 if (length == 0) { 2568 _methods = Universe::the_empty_method_array(); 2569 } else { 2570 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2571 2572 HandleMark hm(THREAD); 2573 for (int index = 0; index < length; index++) { 2574 methodHandle method = parse_method(is_interface, 2575 promoted_flags, 2576 CHECK_NULL); 2577 2578 if (method->is_final()) { 2579 *has_final_method = true; 2580 } 2581 // declares_default_methods: declares concrete instance methods, any access flags 2582 // used for interface initialization, and default method inheritance analysis 2583 if (is_interface && !(*declares_default_methods) 2584 && !method->is_abstract() && !method->is_static()) { 2585 *declares_default_methods = true; 2586 } 2587 _methods->at_put(index, method()); 2588 } 2589 2590 if (_need_verify && length > 1) { 2591 // Check duplicated methods 2592 ResourceMark rm(THREAD); 2593 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2594 THREAD, NameSigHash*, HASH_ROW_SIZE); 2595 initialize_hashtable(names_and_sigs); 2596 bool dup = false; 2597 { 2598 debug_only(No_Safepoint_Verifier nsv;) 2599 for (int i = 0; i < length; i++) { 2600 Method* m = _methods->at(i); 2601 // If no duplicates, add name/signature in hashtable names_and_sigs. 2602 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2603 dup = true; 2604 break; 2605 } 2606 } 2607 } 2608 if (dup) { 2609 classfile_parse_error("Duplicate method name&signature in class file %s", 2610 CHECK_NULL); 2611 } 2612 } 2613 } 2614 return _methods; 2615 } 2616 2617 2618 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2619 int length = methods->length(); 2620 // If JVMTI original method ordering or sharing is enabled we have to 2621 // remember the original class file ordering. 2622 // We temporarily use the vtable_index field in the Method* to store the 2623 // class file index, so we can read in after calling qsort. 2624 // Put the method ordering in the shared archive. 2625 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2626 for (int index = 0; index < length; index++) { 2627 Method* m = methods->at(index); 2628 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2629 m->set_vtable_index(index); 2630 } 2631 } 2632 // Sort method array by ascending method name (for faster lookups & vtable construction) 2633 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2634 Method::sort_methods(methods); 2635 2636 intArray* method_ordering = NULL; 2637 // If JVMTI original method ordering or sharing is enabled construct int 2638 // array remembering the original ordering 2639 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2640 method_ordering = new intArray(length); 2641 for (int index = 0; index < length; index++) { 2642 Method* m = methods->at(index); 2643 int old_index = m->vtable_index(); 2644 assert(old_index >= 0 && old_index < length, "invalid method index"); 2645 method_ordering->at_put(index, old_index); 2646 m->set_vtable_index(Method::invalid_vtable_index); 2647 } 2648 } 2649 return method_ordering; 2650 } 2651 2652 // Parse generic_signature attribute for methods and fields 2653 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2654 ClassFileStream* cfs = stream(); 2655 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2656 u2 generic_signature_index = cfs->get_u2_fast(); 2657 check_property( 2658 valid_symbol_at(generic_signature_index), 2659 "Invalid Signature attribute at constant pool index %u in class file %s", 2660 generic_signature_index, CHECK_0); 2661 return generic_signature_index; 2662 } 2663 2664 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2665 ClassFileStream* cfs = stream(); 2666 cfs->guarantee_more(2, CHECK); // sourcefile_index 2667 u2 sourcefile_index = cfs->get_u2_fast(); 2668 check_property( 2669 valid_symbol_at(sourcefile_index), 2670 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2671 sourcefile_index, CHECK); 2672 set_class_sourcefile_index(sourcefile_index); 2673 } 2674 2675 2676 2677 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2678 ClassFileStream* cfs = stream(); 2679 u1* sde_buffer = cfs->get_u1_buffer(); 2680 assert(sde_buffer != NULL, "null sde buffer"); 2681 2682 // Don't bother storing it if there is no way to retrieve it 2683 if (JvmtiExport::can_get_source_debug_extension()) { 2684 assert((length+1) > length, "Overflow checking"); 2685 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2686 for (int i = 0; i < length; i++) { 2687 sde[i] = sde_buffer[i]; 2688 } 2689 sde[length] = '\0'; 2690 set_class_sde_buffer((char*)sde, length); 2691 } 2692 // Got utf8 string, set stream position forward 2693 cfs->skip_u1(length, CHECK); 2694 } 2695 2696 2697 // Inner classes can be static, private or protected (classic VM does this) 2698 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2699 2700 // Return number of classes in the inner classes attribute table 2701 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2702 bool parsed_enclosingmethod_attribute, 2703 u2 enclosing_method_class_index, 2704 u2 enclosing_method_method_index, 2705 TRAPS) { 2706 ClassFileStream* cfs = stream(); 2707 u1* current_mark = cfs->current(); 2708 u2 length = 0; 2709 if (inner_classes_attribute_start != NULL) { 2710 cfs->set_current(inner_classes_attribute_start); 2711 cfs->guarantee_more(2, CHECK_0); // length 2712 length = cfs->get_u2_fast(); 2713 } 2714 2715 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2716 // method data: 2717 // [inner_class_info_index, 2718 // outer_class_info_index, 2719 // inner_name_index, 2720 // inner_class_access_flags, 2721 // ... 2722 // enclosing_method_class_index, 2723 // enclosing_method_method_index] 2724 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2725 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2726 _inner_classes = inner_classes; 2727 2728 int index = 0; 2729 int cp_size = _cp->length(); 2730 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2731 for (int n = 0; n < length; n++) { 2732 // Inner class index 2733 u2 inner_class_info_index = cfs->get_u2_fast(); 2734 check_property( 2735 inner_class_info_index == 0 || 2736 valid_klass_reference_at(inner_class_info_index), 2737 "inner_class_info_index %u has bad constant type in class file %s", 2738 inner_class_info_index, CHECK_0); 2739 // Outer class index 2740 u2 outer_class_info_index = cfs->get_u2_fast(); 2741 check_property( 2742 outer_class_info_index == 0 || 2743 valid_klass_reference_at(outer_class_info_index), 2744 "outer_class_info_index %u has bad constant type in class file %s", 2745 outer_class_info_index, CHECK_0); 2746 // Inner class name 2747 u2 inner_name_index = cfs->get_u2_fast(); 2748 check_property( 2749 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2750 "inner_name_index %u has bad constant type in class file %s", 2751 inner_name_index, CHECK_0); 2752 if (_need_verify) { 2753 guarantee_property(inner_class_info_index != outer_class_info_index, 2754 "Class is both outer and inner class in class file %s", CHECK_0); 2755 } 2756 // Access flags 2757 AccessFlags inner_access_flags; 2758 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2759 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2760 // Set abstract bit for old class files for backward compatibility 2761 flags |= JVM_ACC_ABSTRACT; 2762 } 2763 verify_legal_class_modifiers(flags, CHECK_0); 2764 inner_access_flags.set_flags(flags); 2765 2766 inner_classes->at_put(index++, inner_class_info_index); 2767 inner_classes->at_put(index++, outer_class_info_index); 2768 inner_classes->at_put(index++, inner_name_index); 2769 inner_classes->at_put(index++, inner_access_flags.as_short()); 2770 } 2771 2772 // 4347400: make sure there's no duplicate entry in the classes array 2773 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2774 for(int i = 0; i < length * 4; i += 4) { 2775 for(int j = i + 4; j < length * 4; j += 4) { 2776 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2777 inner_classes->at(i+1) != inner_classes->at(j+1) || 2778 inner_classes->at(i+2) != inner_classes->at(j+2) || 2779 inner_classes->at(i+3) != inner_classes->at(j+3)), 2780 "Duplicate entry in InnerClasses in class file %s", 2781 CHECK_0); 2782 } 2783 } 2784 } 2785 2786 // Set EnclosingMethod class and method indexes. 2787 if (parsed_enclosingmethod_attribute) { 2788 inner_classes->at_put(index++, enclosing_method_class_index); 2789 inner_classes->at_put(index++, enclosing_method_method_index); 2790 } 2791 assert(index == size, "wrong size"); 2792 2793 // Restore buffer's current position. 2794 cfs->set_current(current_mark); 2795 2796 return length; 2797 } 2798 2799 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2800 set_class_synthetic_flag(true); 2801 } 2802 2803 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2804 ClassFileStream* cfs = stream(); 2805 u2 signature_index = cfs->get_u2(CHECK); 2806 check_property( 2807 valid_symbol_at(signature_index), 2808 "Invalid constant pool index %u in Signature attribute in class file %s", 2809 signature_index, CHECK); 2810 set_class_generic_signature_index(signature_index); 2811 } 2812 2813 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2814 ClassFileStream* cfs = stream(); 2815 u1* current_start = cfs->current(); 2816 2817 guarantee_property(attribute_byte_length >= sizeof(u2), 2818 "Invalid BootstrapMethods attribute length %u in class file %s", 2819 attribute_byte_length, 2820 CHECK); 2821 2822 cfs->guarantee_more(attribute_byte_length, CHECK); 2823 2824 int attribute_array_length = cfs->get_u2_fast(); 2825 2826 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2827 "Short length on BootstrapMethods in class file %s", 2828 CHECK); 2829 2830 2831 // The attribute contains a counted array of counted tuples of shorts, 2832 // represending bootstrap specifiers: 2833 // length*{bootstrap_method_index, argument_count*{argument_index}} 2834 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2835 // operand_count = number of shorts in attr, except for leading length 2836 2837 // The attribute is copied into a short[] array. 2838 // The array begins with a series of short[2] pairs, one for each tuple. 2839 int index_size = (attribute_array_length * 2); 2840 2841 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2842 2843 // Eagerly assign operands so they will be deallocated with the constant 2844 // pool if there is an error. 2845 _cp->set_operands(operands); 2846 2847 int operand_fill_index = index_size; 2848 int cp_size = _cp->length(); 2849 2850 for (int n = 0; n < attribute_array_length; n++) { 2851 // Store a 32-bit offset into the header of the operand array. 2852 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2853 2854 // Read a bootstrap specifier. 2855 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2856 u2 bootstrap_method_index = cfs->get_u2_fast(); 2857 u2 argument_count = cfs->get_u2_fast(); 2858 check_property( 2859 valid_cp_range(bootstrap_method_index, cp_size) && 2860 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2861 "bootstrap_method_index %u has bad constant type in class file %s", 2862 bootstrap_method_index, 2863 CHECK); 2864 2865 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2866 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2867 CHECK); 2868 2869 operands->at_put(operand_fill_index++, bootstrap_method_index); 2870 operands->at_put(operand_fill_index++, argument_count); 2871 2872 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2873 for (int j = 0; j < argument_count; j++) { 2874 u2 argument_index = cfs->get_u2_fast(); 2875 check_property( 2876 valid_cp_range(argument_index, cp_size) && 2877 _cp->tag_at(argument_index).is_loadable_constant(), 2878 "argument_index %u has bad constant type in class file %s", 2879 argument_index, 2880 CHECK); 2881 operands->at_put(operand_fill_index++, argument_index); 2882 } 2883 } 2884 2885 u1* current_end = cfs->current(); 2886 guarantee_property(current_end == current_start + attribute_byte_length, 2887 "Bad length on BootstrapMethods in class file %s", 2888 CHECK); 2889 } 2890 2891 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2892 TRAPS) { 2893 ClassFileStream* cfs = stream(); 2894 // Set inner classes attribute to default sentinel 2895 _inner_classes = Universe::the_empty_short_array(); 2896 cfs->guarantee_more(2, CHECK); // attributes_count 2897 u2 attributes_count = cfs->get_u2_fast(); 2898 bool parsed_sourcefile_attribute = false; 2899 bool parsed_innerclasses_attribute = false; 2900 bool parsed_enclosingmethod_attribute = false; 2901 bool parsed_bootstrap_methods_attribute = false; 2902 u1* runtime_visible_annotations = NULL; 2903 int runtime_visible_annotations_length = 0; 2904 u1* runtime_invisible_annotations = NULL; 2905 int runtime_invisible_annotations_length = 0; 2906 u1* runtime_visible_type_annotations = NULL; 2907 int runtime_visible_type_annotations_length = 0; 2908 u1* runtime_invisible_type_annotations = NULL; 2909 int runtime_invisible_type_annotations_length = 0; 2910 bool runtime_invisible_type_annotations_exists = false; 2911 bool runtime_invisible_annotations_exists = false; 2912 bool parsed_source_debug_ext_annotations_exist = false; 2913 u1* inner_classes_attribute_start = NULL; 2914 u4 inner_classes_attribute_length = 0; 2915 u2 enclosing_method_class_index = 0; 2916 u2 enclosing_method_method_index = 0; 2917 // Iterate over attributes 2918 while (attributes_count--) { 2919 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2920 u2 attribute_name_index = cfs->get_u2_fast(); 2921 u4 attribute_length = cfs->get_u4_fast(); 2922 check_property( 2923 valid_symbol_at(attribute_name_index), 2924 "Attribute name has bad constant pool index %u in class file %s", 2925 attribute_name_index, CHECK); 2926 Symbol* tag = _cp->symbol_at(attribute_name_index); 2927 if (tag == vmSymbols::tag_source_file()) { 2928 // Check for SourceFile tag 2929 if (_need_verify) { 2930 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2931 } 2932 if (parsed_sourcefile_attribute) { 2933 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2934 } else { 2935 parsed_sourcefile_attribute = true; 2936 } 2937 parse_classfile_sourcefile_attribute(CHECK); 2938 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2939 // Check for SourceDebugExtension tag 2940 if (parsed_source_debug_ext_annotations_exist) { 2941 classfile_parse_error( 2942 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 2943 } 2944 parsed_source_debug_ext_annotations_exist = true; 2945 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2946 } else if (tag == vmSymbols::tag_inner_classes()) { 2947 // Check for InnerClasses tag 2948 if (parsed_innerclasses_attribute) { 2949 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2950 } else { 2951 parsed_innerclasses_attribute = true; 2952 } 2953 inner_classes_attribute_start = cfs->get_u1_buffer(); 2954 inner_classes_attribute_length = attribute_length; 2955 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2956 } else if (tag == vmSymbols::tag_synthetic()) { 2957 // Check for Synthetic tag 2958 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2959 if (attribute_length != 0) { 2960 classfile_parse_error( 2961 "Invalid Synthetic classfile attribute length %u in class file %s", 2962 attribute_length, CHECK); 2963 } 2964 parse_classfile_synthetic_attribute(CHECK); 2965 } else if (tag == vmSymbols::tag_deprecated()) { 2966 // Check for Deprecatd tag - 4276120 2967 if (attribute_length != 0) { 2968 classfile_parse_error( 2969 "Invalid Deprecated classfile attribute length %u in class file %s", 2970 attribute_length, CHECK); 2971 } 2972 } else if (_major_version >= JAVA_1_5_VERSION) { 2973 if (tag == vmSymbols::tag_signature()) { 2974 if (attribute_length != 2) { 2975 classfile_parse_error( 2976 "Wrong Signature attribute length %u in class file %s", 2977 attribute_length, CHECK); 2978 } 2979 parse_classfile_signature_attribute(CHECK); 2980 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2981 if (runtime_visible_annotations != NULL) { 2982 classfile_parse_error( 2983 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 2984 } 2985 runtime_visible_annotations_length = attribute_length; 2986 runtime_visible_annotations = cfs->get_u1_buffer(); 2987 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2988 parse_annotations(runtime_visible_annotations, 2989 runtime_visible_annotations_length, 2990 parsed_annotations, 2991 CHECK); 2992 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2993 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 2994 if (runtime_invisible_annotations_exists) { 2995 classfile_parse_error( 2996 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 2997 } 2998 runtime_invisible_annotations_exists = true; 2999 if (PreserveAllAnnotations) { 3000 runtime_invisible_annotations_length = attribute_length; 3001 runtime_invisible_annotations = cfs->get_u1_buffer(); 3002 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3003 } 3004 cfs->skip_u1(attribute_length, CHECK); 3005 } else if (tag == vmSymbols::tag_enclosing_method()) { 3006 if (parsed_enclosingmethod_attribute) { 3007 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3008 } else { 3009 parsed_enclosingmethod_attribute = true; 3010 } 3011 guarantee_property(attribute_length == 4, 3012 "Wrong EnclosingMethod attribute length %u in class file %s", 3013 attribute_length, CHECK); 3014 cfs->guarantee_more(4, CHECK); // class_index, method_index 3015 enclosing_method_class_index = cfs->get_u2_fast(); 3016 enclosing_method_method_index = cfs->get_u2_fast(); 3017 if (enclosing_method_class_index == 0) { 3018 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3019 } 3020 // Validate the constant pool indices and types 3021 check_property(valid_klass_reference_at(enclosing_method_class_index), 3022 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3023 if (enclosing_method_method_index != 0 && 3024 (!_cp->is_within_bounds(enclosing_method_method_index) || 3025 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3026 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3027 } 3028 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3029 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3030 if (parsed_bootstrap_methods_attribute) 3031 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3032 parsed_bootstrap_methods_attribute = true; 3033 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 3034 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3035 if (runtime_visible_type_annotations != NULL) { 3036 classfile_parse_error( 3037 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3038 } 3039 runtime_visible_type_annotations_length = attribute_length; 3040 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3041 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3042 // No need for the VM to parse Type annotations 3043 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3044 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3045 if (runtime_invisible_type_annotations_exists) { 3046 classfile_parse_error( 3047 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3048 } else { 3049 runtime_invisible_type_annotations_exists = true; 3050 } 3051 if (PreserveAllAnnotations) { 3052 runtime_invisible_type_annotations_length = attribute_length; 3053 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3054 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3055 } 3056 cfs->skip_u1(attribute_length, CHECK); 3057 } else { 3058 // Unknown attribute 3059 cfs->skip_u1(attribute_length, CHECK); 3060 } 3061 } else { 3062 // Unknown attribute 3063 cfs->skip_u1(attribute_length, CHECK); 3064 } 3065 } 3066 _annotations = assemble_annotations(runtime_visible_annotations, 3067 runtime_visible_annotations_length, 3068 runtime_invisible_annotations, 3069 runtime_invisible_annotations_length, 3070 CHECK); 3071 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3072 runtime_visible_type_annotations_length, 3073 runtime_invisible_type_annotations, 3074 runtime_invisible_type_annotations_length, 3075 CHECK); 3076 3077 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3078 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3079 inner_classes_attribute_start, 3080 parsed_innerclasses_attribute, 3081 enclosing_method_class_index, 3082 enclosing_method_method_index, 3083 CHECK); 3084 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3085 guarantee_property( 3086 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3087 "Wrong InnerClasses attribute length in class file %s", CHECK); 3088 } 3089 } 3090 3091 if (_max_bootstrap_specifier_index >= 0) { 3092 guarantee_property(parsed_bootstrap_methods_attribute, 3093 "Missing BootstrapMethods attribute in class file %s", CHECK); 3094 } 3095 } 3096 3097 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3098 if (_synthetic_flag) 3099 k->set_is_synthetic(); 3100 if (_sourcefile_index != 0) { 3101 k->set_source_file_name_index(_sourcefile_index); 3102 } 3103 if (_generic_signature_index != 0) { 3104 k->set_generic_signature_index(_generic_signature_index); 3105 } 3106 if (_sde_buffer != NULL) { 3107 k->set_source_debug_extension(_sde_buffer, _sde_length); 3108 } 3109 } 3110 3111 // Create the Annotations object that will 3112 // hold the annotations array for the Klass. 3113 void ClassFileParser::create_combined_annotations(TRAPS) { 3114 if (_annotations == NULL && 3115 _type_annotations == NULL && 3116 _fields_annotations == NULL && 3117 _fields_type_annotations == NULL) { 3118 // Don't create the Annotations object unnecessarily. 3119 return; 3120 } 3121 3122 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3123 annotations->set_class_annotations(_annotations); 3124 annotations->set_class_type_annotations(_type_annotations); 3125 annotations->set_fields_annotations(_fields_annotations); 3126 annotations->set_fields_type_annotations(_fields_type_annotations); 3127 3128 // This is the Annotations object that will be 3129 // assigned to InstanceKlass being constructed. 3130 _combined_annotations = annotations; 3131 3132 // The annotations arrays below has been transfered the 3133 // _combined_annotations so these fields can now be cleared. 3134 _annotations = NULL; 3135 _type_annotations = NULL; 3136 _fields_annotations = NULL; 3137 _fields_type_annotations = NULL; 3138 } 3139 3140 // Transfer ownership of metadata allocated to the InstanceKlass. 3141 void ClassFileParser::apply_parsed_class_metadata( 3142 instanceKlassHandle this_klass, 3143 int java_fields_count, TRAPS) { 3144 _cp->set_pool_holder(this_klass()); 3145 this_klass->set_constants(_cp); 3146 this_klass->set_fields(_fields, java_fields_count); 3147 this_klass->set_methods(_methods); 3148 this_klass->set_inner_classes(_inner_classes); 3149 this_klass->set_local_interfaces(_local_interfaces); 3150 this_klass->set_transitive_interfaces(_transitive_interfaces); 3151 this_klass->set_annotations(_combined_annotations); 3152 3153 // Clear out these fields so they don't get deallocated by the destructor 3154 clear_class_metadata(); 3155 } 3156 3157 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3158 int runtime_visible_annotations_length, 3159 u1* runtime_invisible_annotations, 3160 int runtime_invisible_annotations_length, TRAPS) { 3161 AnnotationArray* annotations = NULL; 3162 if (runtime_visible_annotations != NULL || 3163 runtime_invisible_annotations != NULL) { 3164 annotations = MetadataFactory::new_array<u1>(_loader_data, 3165 runtime_visible_annotations_length + 3166 runtime_invisible_annotations_length, 3167 CHECK_(annotations)); 3168 if (runtime_visible_annotations != NULL) { 3169 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3170 annotations->at_put(i, runtime_visible_annotations[i]); 3171 } 3172 } 3173 if (runtime_invisible_annotations != NULL) { 3174 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3175 int append = runtime_visible_annotations_length+i; 3176 annotations->at_put(append, runtime_invisible_annotations[i]); 3177 } 3178 } 3179 } 3180 return annotations; 3181 } 3182 3183 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3184 TRAPS) { 3185 instanceKlassHandle super_klass; 3186 if (super_class_index == 0) { 3187 check_property(_class_name == vmSymbols::java_lang_Object(), 3188 "Invalid superclass index %u in class file %s", 3189 super_class_index, 3190 CHECK_NULL); 3191 } else { 3192 check_property(valid_klass_reference_at(super_class_index), 3193 "Invalid superclass index %u in class file %s", 3194 super_class_index, 3195 CHECK_NULL); 3196 // The class name should be legal because it is checked when parsing constant pool. 3197 // However, make sure it is not an array type. 3198 bool is_array = false; 3199 if (_cp->tag_at(super_class_index).is_klass()) { 3200 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3201 if (_need_verify) 3202 is_array = super_klass->oop_is_array(); 3203 } else if (_need_verify) { 3204 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3205 } 3206 if (_need_verify) { 3207 guarantee_property(!is_array, 3208 "Bad superclass name in class file %s", CHECK_NULL); 3209 } 3210 } 3211 return super_klass; 3212 } 3213 3214 3215 // Values needed for oopmap and InstanceKlass creation 3216 class FieldLayoutInfo : public StackObj { 3217 public: 3218 int* nonstatic_oop_offsets; 3219 unsigned int* nonstatic_oop_counts; 3220 unsigned int nonstatic_oop_map_count; 3221 unsigned int total_oop_map_count; 3222 int instance_size; 3223 int nonstatic_field_size; 3224 int static_field_size; 3225 bool has_nonstatic_fields; 3226 }; 3227 3228 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3229 void ClassFileParser::layout_fields(Handle class_loader, 3230 FieldAllocationCount* fac, 3231 ClassAnnotationCollector* parsed_annotations, 3232 FieldLayoutInfo* info, 3233 TRAPS) { 3234 3235 // Field size and offset computation 3236 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3237 int next_static_oop_offset; 3238 int next_static_double_offset; 3239 int next_static_word_offset; 3240 int next_static_short_offset; 3241 int next_static_byte_offset; 3242 int next_nonstatic_oop_offset; 3243 int next_nonstatic_double_offset; 3244 int next_nonstatic_word_offset; 3245 int next_nonstatic_short_offset; 3246 int next_nonstatic_byte_offset; 3247 int first_nonstatic_oop_offset; 3248 int next_nonstatic_field_offset; 3249 int next_nonstatic_padded_offset; 3250 3251 // Count the contended fields by type. 3252 // 3253 // We ignore static fields, because @Contended is not supported for them. 3254 // The layout code below will also ignore the static fields. 3255 int nonstatic_contended_count = 0; 3256 FieldAllocationCount fac_contended; 3257 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3258 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3259 if (fs.is_contended()) { 3260 fac_contended.count[atype]++; 3261 if (!fs.access_flags().is_static()) { 3262 nonstatic_contended_count++; 3263 } 3264 } 3265 } 3266 3267 3268 // Calculate the starting byte offsets 3269 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3270 next_static_double_offset = next_static_oop_offset + 3271 ((fac->count[STATIC_OOP]) * heapOopSize); 3272 if ( fac->count[STATIC_DOUBLE] && 3273 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3274 Universe::field_type_should_be_aligned(T_LONG)) ) { 3275 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3276 } 3277 3278 next_static_word_offset = next_static_double_offset + 3279 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3280 next_static_short_offset = next_static_word_offset + 3281 ((fac->count[STATIC_WORD]) * BytesPerInt); 3282 next_static_byte_offset = next_static_short_offset + 3283 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3284 3285 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3286 nonstatic_field_size * heapOopSize; 3287 3288 next_nonstatic_field_offset = nonstatic_fields_start; 3289 3290 bool is_contended_class = parsed_annotations->is_contended(); 3291 3292 // Class is contended, pad before all the fields 3293 if (is_contended_class) { 3294 next_nonstatic_field_offset += ContendedPaddingWidth; 3295 } 3296 3297 // Compute the non-contended fields count. 3298 // The packing code below relies on these counts to determine if some field 3299 // can be squeezed into the alignment gap. Contended fields are obviously 3300 // exempt from that. 3301 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3302 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3303 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3304 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3305 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3306 3307 // Total non-static fields count, including every contended field 3308 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3309 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3310 fac->count[NONSTATIC_OOP]; 3311 3312 bool super_has_nonstatic_fields = 3313 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3314 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3315 3316 3317 // Prepare list of oops for oop map generation. 3318 // 3319 // "offset" and "count" lists are describing the set of contiguous oop 3320 // regions. offset[i] is the start of the i-th region, which then has 3321 // count[i] oops following. Before we know how many regions are required, 3322 // we pessimistically allocate the maps to fit all the oops into the 3323 // distinct regions. 3324 // 3325 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3326 // to figure out if we still need to do this. 3327 int* nonstatic_oop_offsets; 3328 unsigned int* nonstatic_oop_counts; 3329 unsigned int nonstatic_oop_map_count = 0; 3330 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3331 3332 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3333 THREAD, int, max_nonstatic_oop_maps); 3334 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3335 THREAD, unsigned int, max_nonstatic_oop_maps); 3336 3337 first_nonstatic_oop_offset = 0; // will be set for first oop field 3338 3339 bool compact_fields = CompactFields; 3340 int allocation_style = FieldsAllocationStyle; 3341 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3342 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3343 allocation_style = 1; // Optimistic 3344 } 3345 3346 // The next classes have predefined hard-coded fields offsets 3347 // (see in JavaClasses::compute_hard_coded_offsets()). 3348 // Use default fields allocation order for them. 3349 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3350 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3351 _class_name == vmSymbols::java_lang_Class() || 3352 _class_name == vmSymbols::java_lang_ClassLoader() || 3353 _class_name == vmSymbols::java_lang_ref_Reference() || 3354 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3355 _class_name == vmSymbols::java_lang_StackTraceElement() || 3356 _class_name == vmSymbols::java_lang_String() || 3357 _class_name == vmSymbols::java_lang_Throwable() || 3358 _class_name == vmSymbols::java_lang_Boolean() || 3359 _class_name == vmSymbols::java_lang_Character() || 3360 _class_name == vmSymbols::java_lang_Float() || 3361 _class_name == vmSymbols::java_lang_Double() || 3362 _class_name == vmSymbols::java_lang_Byte() || 3363 _class_name == vmSymbols::java_lang_Short() || 3364 _class_name == vmSymbols::java_lang_Integer() || 3365 _class_name == vmSymbols::java_lang_Long())) { 3366 allocation_style = 0; // Allocate oops first 3367 compact_fields = false; // Don't compact fields 3368 } 3369 3370 // Rearrange fields for a given allocation style 3371 if( allocation_style == 0 ) { 3372 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3373 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3374 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3375 (nonstatic_oop_count * heapOopSize); 3376 } else if( allocation_style == 1 ) { 3377 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3378 next_nonstatic_double_offset = next_nonstatic_field_offset; 3379 } else if( allocation_style == 2 ) { 3380 // Fields allocation: oops fields in super and sub classes are together. 3381 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3382 _super_klass->nonstatic_oop_map_size() > 0 ) { 3383 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3384 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3385 OopMapBlock* last_map = first_map + map_count - 1; 3386 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3387 if (next_offset == next_nonstatic_field_offset) { 3388 allocation_style = 0; // allocate oops first 3389 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3390 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3391 (nonstatic_oop_count * heapOopSize); 3392 } 3393 } 3394 if( allocation_style == 2 ) { 3395 allocation_style = 1; // allocate oops last 3396 next_nonstatic_double_offset = next_nonstatic_field_offset; 3397 } 3398 } else { 3399 ShouldNotReachHere(); 3400 } 3401 3402 int nonstatic_oop_space_count = 0; 3403 int nonstatic_word_space_count = 0; 3404 int nonstatic_short_space_count = 0; 3405 int nonstatic_byte_space_count = 0; 3406 int nonstatic_oop_space_offset; 3407 int nonstatic_word_space_offset; 3408 int nonstatic_short_space_offset; 3409 int nonstatic_byte_space_offset; 3410 3411 // Try to squeeze some of the fields into the gaps due to 3412 // long/double alignment. 3413 if( nonstatic_double_count > 0 ) { 3414 int offset = next_nonstatic_double_offset; 3415 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3416 if( compact_fields && offset != next_nonstatic_double_offset ) { 3417 // Allocate available fields into the gap before double field. 3418 int length = next_nonstatic_double_offset - offset; 3419 assert(length == BytesPerInt, ""); 3420 nonstatic_word_space_offset = offset; 3421 if( nonstatic_word_count > 0 ) { 3422 nonstatic_word_count -= 1; 3423 nonstatic_word_space_count = 1; // Only one will fit 3424 length -= BytesPerInt; 3425 offset += BytesPerInt; 3426 } 3427 nonstatic_short_space_offset = offset; 3428 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3429 nonstatic_short_count -= 1; 3430 nonstatic_short_space_count += 1; 3431 length -= BytesPerShort; 3432 offset += BytesPerShort; 3433 } 3434 nonstatic_byte_space_offset = offset; 3435 while( length > 0 && nonstatic_byte_count > 0 ) { 3436 nonstatic_byte_count -= 1; 3437 nonstatic_byte_space_count += 1; 3438 length -= 1; 3439 } 3440 // Allocate oop field in the gap if there are no other fields for that. 3441 nonstatic_oop_space_offset = offset; 3442 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3443 allocation_style != 0 ) { // when oop fields not first 3444 nonstatic_oop_count -= 1; 3445 nonstatic_oop_space_count = 1; // Only one will fit 3446 length -= heapOopSize; 3447 offset += heapOopSize; 3448 } 3449 } 3450 } 3451 3452 next_nonstatic_word_offset = next_nonstatic_double_offset + 3453 (nonstatic_double_count * BytesPerLong); 3454 next_nonstatic_short_offset = next_nonstatic_word_offset + 3455 (nonstatic_word_count * BytesPerInt); 3456 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3457 (nonstatic_short_count * BytesPerShort); 3458 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3459 nonstatic_byte_count; 3460 3461 // let oops jump before padding with this allocation style 3462 if( allocation_style == 1 ) { 3463 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3464 if( nonstatic_oop_count > 0 ) { 3465 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3466 } 3467 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3468 } 3469 3470 // Iterate over fields again and compute correct offsets. 3471 // The field allocation type was temporarily stored in the offset slot. 3472 // oop fields are located before non-oop fields (static and non-static). 3473 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3474 3475 // skip already laid out fields 3476 if (fs.is_offset_set()) continue; 3477 3478 // contended instance fields are handled below 3479 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3480 3481 int real_offset; 3482 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3483 3484 // pack the rest of the fields 3485 switch (atype) { 3486 case STATIC_OOP: 3487 real_offset = next_static_oop_offset; 3488 next_static_oop_offset += heapOopSize; 3489 break; 3490 case STATIC_BYTE: 3491 real_offset = next_static_byte_offset; 3492 next_static_byte_offset += 1; 3493 break; 3494 case STATIC_SHORT: 3495 real_offset = next_static_short_offset; 3496 next_static_short_offset += BytesPerShort; 3497 break; 3498 case STATIC_WORD: 3499 real_offset = next_static_word_offset; 3500 next_static_word_offset += BytesPerInt; 3501 break; 3502 case STATIC_DOUBLE: 3503 real_offset = next_static_double_offset; 3504 next_static_double_offset += BytesPerLong; 3505 break; 3506 case NONSTATIC_OOP: 3507 if( nonstatic_oop_space_count > 0 ) { 3508 real_offset = nonstatic_oop_space_offset; 3509 nonstatic_oop_space_offset += heapOopSize; 3510 nonstatic_oop_space_count -= 1; 3511 } else { 3512 real_offset = next_nonstatic_oop_offset; 3513 next_nonstatic_oop_offset += heapOopSize; 3514 } 3515 3516 // Record this oop in the oop maps 3517 if( nonstatic_oop_map_count > 0 && 3518 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3519 real_offset - 3520 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3521 heapOopSize ) { 3522 // This oop is adjacent to the previous one, add to current oop map 3523 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3524 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3525 } else { 3526 // This oop is not adjacent to the previous one, create new oop map 3527 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3528 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3529 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3530 nonstatic_oop_map_count += 1; 3531 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3532 first_nonstatic_oop_offset = real_offset; 3533 } 3534 } 3535 break; 3536 case NONSTATIC_BYTE: 3537 if( nonstatic_byte_space_count > 0 ) { 3538 real_offset = nonstatic_byte_space_offset; 3539 nonstatic_byte_space_offset += 1; 3540 nonstatic_byte_space_count -= 1; 3541 } else { 3542 real_offset = next_nonstatic_byte_offset; 3543 next_nonstatic_byte_offset += 1; 3544 } 3545 break; 3546 case NONSTATIC_SHORT: 3547 if( nonstatic_short_space_count > 0 ) { 3548 real_offset = nonstatic_short_space_offset; 3549 nonstatic_short_space_offset += BytesPerShort; 3550 nonstatic_short_space_count -= 1; 3551 } else { 3552 real_offset = next_nonstatic_short_offset; 3553 next_nonstatic_short_offset += BytesPerShort; 3554 } 3555 break; 3556 case NONSTATIC_WORD: 3557 if( nonstatic_word_space_count > 0 ) { 3558 real_offset = nonstatic_word_space_offset; 3559 nonstatic_word_space_offset += BytesPerInt; 3560 nonstatic_word_space_count -= 1; 3561 } else { 3562 real_offset = next_nonstatic_word_offset; 3563 next_nonstatic_word_offset += BytesPerInt; 3564 } 3565 break; 3566 case NONSTATIC_DOUBLE: 3567 real_offset = next_nonstatic_double_offset; 3568 next_nonstatic_double_offset += BytesPerLong; 3569 break; 3570 default: 3571 ShouldNotReachHere(); 3572 } 3573 fs.set_offset(real_offset); 3574 } 3575 3576 3577 // Handle the contended cases. 3578 // 3579 // Each contended field should not intersect the cache line with another contended field. 3580 // In the absence of alignment information, we end up with pessimistically separating 3581 // the fields with full-width padding. 3582 // 3583 // Additionally, this should not break alignment for the fields, so we round the alignment up 3584 // for each field. 3585 if (nonstatic_contended_count > 0) { 3586 3587 // if there is at least one contended field, we need to have pre-padding for them 3588 next_nonstatic_padded_offset += ContendedPaddingWidth; 3589 3590 // collect all contended groups 3591 BitMap bm(_cp->size()); 3592 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3593 // skip already laid out fields 3594 if (fs.is_offset_set()) continue; 3595 3596 if (fs.is_contended()) { 3597 bm.set_bit(fs.contended_group()); 3598 } 3599 } 3600 3601 int current_group = -1; 3602 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3603 3604 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3605 3606 // skip already laid out fields 3607 if (fs.is_offset_set()) continue; 3608 3609 // skip non-contended fields and fields from different group 3610 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3611 3612 // handle statics below 3613 if (fs.access_flags().is_static()) continue; 3614 3615 int real_offset; 3616 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3617 3618 switch (atype) { 3619 case NONSTATIC_BYTE: 3620 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3621 real_offset = next_nonstatic_padded_offset; 3622 next_nonstatic_padded_offset += 1; 3623 break; 3624 3625 case NONSTATIC_SHORT: 3626 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3627 real_offset = next_nonstatic_padded_offset; 3628 next_nonstatic_padded_offset += BytesPerShort; 3629 break; 3630 3631 case NONSTATIC_WORD: 3632 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3633 real_offset = next_nonstatic_padded_offset; 3634 next_nonstatic_padded_offset += BytesPerInt; 3635 break; 3636 3637 case NONSTATIC_DOUBLE: 3638 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3639 real_offset = next_nonstatic_padded_offset; 3640 next_nonstatic_padded_offset += BytesPerLong; 3641 break; 3642 3643 case NONSTATIC_OOP: 3644 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3645 real_offset = next_nonstatic_padded_offset; 3646 next_nonstatic_padded_offset += heapOopSize; 3647 3648 // Record this oop in the oop maps 3649 if( nonstatic_oop_map_count > 0 && 3650 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3651 real_offset - 3652 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3653 heapOopSize ) { 3654 // This oop is adjacent to the previous one, add to current oop map 3655 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3656 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3657 } else { 3658 // This oop is not adjacent to the previous one, create new oop map 3659 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3660 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3661 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3662 nonstatic_oop_map_count += 1; 3663 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3664 first_nonstatic_oop_offset = real_offset; 3665 } 3666 } 3667 break; 3668 3669 default: 3670 ShouldNotReachHere(); 3671 } 3672 3673 if (fs.contended_group() == 0) { 3674 // Contended group defines the equivalence class over the fields: 3675 // the fields within the same contended group are not inter-padded. 3676 // The only exception is default group, which does not incur the 3677 // equivalence, and so requires intra-padding. 3678 next_nonstatic_padded_offset += ContendedPaddingWidth; 3679 } 3680 3681 fs.set_offset(real_offset); 3682 } // for 3683 3684 // Start laying out the next group. 3685 // Note that this will effectively pad the last group in the back; 3686 // this is expected to alleviate memory contention effects for 3687 // subclass fields and/or adjacent object. 3688 // If this was the default group, the padding is already in place. 3689 if (current_group != 0) { 3690 next_nonstatic_padded_offset += ContendedPaddingWidth; 3691 } 3692 } 3693 3694 // handle static fields 3695 } 3696 3697 // Entire class is contended, pad in the back. 3698 // This helps to alleviate memory contention effects for subclass fields 3699 // and/or adjacent object. 3700 if (is_contended_class) { 3701 next_nonstatic_padded_offset += ContendedPaddingWidth; 3702 } 3703 3704 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3705 3706 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3707 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3708 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3709 3710 int static_field_size = (static_fields_end - 3711 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3712 nonstatic_field_size = nonstatic_field_size + 3713 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3714 3715 int instance_size = align_object_size(instance_end / wordSize); 3716 3717 assert(instance_size == align_object_size(align_size_up( 3718 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3719 wordSize) / wordSize), "consistent layout helper value"); 3720 3721 // Invariant: nonstatic_field end/start should only change if there are 3722 // nonstatic fields in the class, or if the class is contended. We compare 3723 // against the non-aligned value, so that end alignment will not fail the 3724 // assert without actually having the fields. 3725 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3726 is_contended_class || 3727 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3728 3729 // Number of non-static oop map blocks allocated at end of klass. 3730 const unsigned int total_oop_map_count = 3731 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3732 first_nonstatic_oop_offset); 3733 3734 #ifndef PRODUCT 3735 if (PrintFieldLayout) { 3736 print_field_layout(_class_name, 3737 _fields, 3738 _cp, 3739 instance_size, 3740 nonstatic_fields_start, 3741 nonstatic_fields_end, 3742 static_fields_end); 3743 } 3744 3745 #endif 3746 // Pass back information needed for InstanceKlass creation 3747 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3748 info->nonstatic_oop_counts = nonstatic_oop_counts; 3749 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3750 info->total_oop_map_count = total_oop_map_count; 3751 info->instance_size = instance_size; 3752 info->static_field_size = static_field_size; 3753 info->nonstatic_field_size = nonstatic_field_size; 3754 info->has_nonstatic_fields = has_nonstatic_fields; 3755 } 3756 3757 3758 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3759 ClassLoaderData* loader_data, 3760 Handle protection_domain, 3761 KlassHandle host_klass, 3762 GrowableArray<Handle>* cp_patches, 3763 TempNewSymbol& parsed_name, 3764 bool verify, 3765 TRAPS) { 3766 3767 // When a retransformable agent is attached, JVMTI caches the 3768 // class bytes that existed before the first retransformation. 3769 // If RedefineClasses() was used before the retransformable 3770 // agent attached, then the cached class bytes may not be the 3771 // original class bytes. 3772 JvmtiCachedClassFileData *cached_class_file = NULL; 3773 Handle class_loader(THREAD, loader_data->class_loader()); 3774 bool has_default_methods = false; 3775 bool declares_default_methods = false; 3776 ResourceMark rm(THREAD); 3777 3778 ClassFileStream* cfs = stream(); 3779 // Timing 3780 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3781 JavaThread* jt = (JavaThread*) THREAD; 3782 3783 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3784 ClassLoader::perf_class_parse_selftime(), 3785 NULL, 3786 jt->get_thread_stat()->perf_recursion_counts_addr(), 3787 jt->get_thread_stat()->perf_timers_addr(), 3788 PerfClassTraceTime::PARSE_CLASS); 3789 3790 init_parsed_class_attributes(loader_data); 3791 3792 if (JvmtiExport::should_post_class_file_load_hook()) { 3793 // Get the cached class file bytes (if any) from the class that 3794 // is being redefined or retransformed. We use jvmti_thread_state() 3795 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3796 // a JvmtiThreadState any earlier than necessary. This will help 3797 // avoid the bug described by 7126851. 3798 JvmtiThreadState *state = jt->jvmti_thread_state(); 3799 if (state != NULL) { 3800 KlassHandle *h_class_being_redefined = 3801 state->get_class_being_redefined(); 3802 if (h_class_being_redefined != NULL) { 3803 instanceKlassHandle ikh_class_being_redefined = 3804 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3805 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3806 } 3807 } 3808 3809 unsigned char* ptr = cfs->buffer(); 3810 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3811 3812 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3813 &ptr, &end_ptr, &cached_class_file); 3814 3815 if (ptr != cfs->buffer()) { 3816 // JVMTI agent has modified class file data. 3817 // Set new class file stream using JVMTI agent modified 3818 // class file data. 3819 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3820 set_stream(cfs); 3821 } 3822 } 3823 3824 _host_klass = host_klass; 3825 _cp_patches = cp_patches; 3826 3827 instanceKlassHandle nullHandle; 3828 3829 // Figure out whether we can skip format checking (matching classic VM behavior) 3830 if (DumpSharedSpaces) { 3831 // verify == true means it's a 'remote' class (i.e., non-boot class) 3832 // Verification decision is based on BytecodeVerificationRemote flag 3833 // for those classes. 3834 _need_verify = (verify) ? BytecodeVerificationRemote : 3835 BytecodeVerificationLocal; 3836 } else { 3837 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3838 } 3839 3840 // Set the verify flag in stream 3841 cfs->set_verify(_need_verify); 3842 3843 // Save the class file name for easier error message printing. 3844 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3845 3846 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3847 // Magic value 3848 u4 magic = cfs->get_u4_fast(); 3849 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3850 "Incompatible magic value %u in class file %s", 3851 magic, CHECK_(nullHandle)); 3852 3853 // Version numbers 3854 u2 minor_version = cfs->get_u2_fast(); 3855 u2 major_version = cfs->get_u2_fast(); 3856 3857 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3858 ResourceMark rm; 3859 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3860 major_version, minor_version, name->as_C_string()); 3861 Exceptions::fthrow( 3862 THREAD_AND_LOCATION, 3863 vmSymbols::java_lang_UnsupportedClassVersionError(), 3864 "Unsupported major.minor version for dump time %u.%u", 3865 major_version, 3866 minor_version); 3867 } 3868 3869 // Check version numbers - we check this even with verifier off 3870 if (!is_supported_version(major_version, minor_version)) { 3871 if (name == NULL) { 3872 Exceptions::fthrow( 3873 THREAD_AND_LOCATION, 3874 vmSymbols::java_lang_UnsupportedClassVersionError(), 3875 "Unsupported class file version %u.%u, " 3876 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3877 major_version, 3878 minor_version, 3879 JAVA_MAX_SUPPORTED_VERSION, 3880 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3881 } else { 3882 ResourceMark rm(THREAD); 3883 Exceptions::fthrow( 3884 THREAD_AND_LOCATION, 3885 vmSymbols::java_lang_UnsupportedClassVersionError(), 3886 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3887 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3888 name->as_C_string(), 3889 major_version, 3890 minor_version, 3891 JAVA_MAX_SUPPORTED_VERSION, 3892 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3893 } 3894 return nullHandle; 3895 } 3896 3897 _major_version = major_version; 3898 _minor_version = minor_version; 3899 3900 3901 // Check if verification needs to be relaxed for this class file 3902 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3903 _relax_verify = Verifier::relax_verify_for(class_loader()); 3904 3905 // Constant pool 3906 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3907 3908 int cp_size = cp->length(); 3909 3910 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3911 3912 // Access flags 3913 AccessFlags access_flags; 3914 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3915 3916 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3917 // Set abstract bit for old class files for backward compatibility 3918 flags |= JVM_ACC_ABSTRACT; 3919 } 3920 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3921 access_flags.set_flags(flags); 3922 3923 // This class and superclass 3924 u2 this_class_index = cfs->get_u2_fast(); 3925 check_property( 3926 valid_cp_range(this_class_index, cp_size) && 3927 cp->tag_at(this_class_index).is_unresolved_klass(), 3928 "Invalid this class index %u in constant pool in class file %s", 3929 this_class_index, CHECK_(nullHandle)); 3930 3931 Symbol* class_name = cp->klass_name_at(this_class_index); 3932 assert(class_name != NULL, "class_name can't be null"); 3933 3934 // It's important to set parsed_name *before* resolving the super class. 3935 // (it's used for cleanup by the caller if parsing fails) 3936 parsed_name = class_name; 3937 // parsed_name is returned and can be used if there's an error, so add to 3938 // its reference count. Caller will decrement the refcount. 3939 parsed_name->increment_refcount(); 3940 3941 // Update _class_name which could be null previously to be class_name 3942 _class_name = class_name; 3943 3944 // Don't need to check whether this class name is legal or not. 3945 // It has been checked when constant pool is parsed. 3946 // However, make sure it is not an array type. 3947 if (_need_verify) { 3948 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3949 "Bad class name in class file %s", 3950 CHECK_(nullHandle)); 3951 } 3952 3953 Klass* preserve_this_klass; // for storing result across HandleMark 3954 3955 // release all handles when parsing is done 3956 { HandleMark hm(THREAD); 3957 3958 // Checks if name in class file matches requested name 3959 if (name != NULL && class_name != name) { 3960 ResourceMark rm(THREAD); 3961 Exceptions::fthrow( 3962 THREAD_AND_LOCATION, 3963 vmSymbols::java_lang_NoClassDefFoundError(), 3964 "%s (wrong name: %s)", 3965 name->as_C_string(), 3966 class_name->as_C_string() 3967 ); 3968 return nullHandle; 3969 } 3970 3971 if (TraceClassLoadingPreorder) { 3972 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3973 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3974 tty->print_cr("]"); 3975 } 3976 #if INCLUDE_CDS 3977 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3978 // Only dump the classes that can be stored into CDS archive 3979 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3980 if (name != NULL) { 3981 ResourceMark rm(THREAD); 3982 classlist_file->print_cr("%s", name->as_C_string()); 3983 classlist_file->flush(); 3984 } 3985 } 3986 } 3987 #endif 3988 3989 u2 super_class_index = cfs->get_u2_fast(); 3990 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3991 CHECK_NULL); 3992 3993 // Interfaces 3994 u2 itfs_len = cfs->get_u2_fast(); 3995 Array<Klass*>* local_interfaces = 3996 parse_interfaces(itfs_len, protection_domain, _class_name, 3997 &has_default_methods, CHECK_(nullHandle)); 3998 3999 u2 java_fields_count = 0; 4000 // Fields (offsets are filled in later) 4001 FieldAllocationCount fac; 4002 Array<u2>* fields = parse_fields(class_name, 4003 access_flags.is_interface(), 4004 &fac, &java_fields_count, 4005 CHECK_(nullHandle)); 4006 // Methods 4007 bool has_final_method = false; 4008 AccessFlags promoted_flags; 4009 promoted_flags.set_flags(0); 4010 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 4011 &promoted_flags, 4012 &has_final_method, 4013 &declares_default_methods, 4014 CHECK_(nullHandle)); 4015 4016 if (declares_default_methods) { 4017 has_default_methods = true; 4018 } 4019 4020 // Additional attributes 4021 ClassAnnotationCollector parsed_annotations; 4022 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 4023 4024 // Finalize the Annotations metadata object, 4025 // now that all annotation arrays have been created. 4026 create_combined_annotations(CHECK_(nullHandle)); 4027 4028 // Make sure this is the end of class file stream 4029 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 4030 4031 // We check super class after class file is parsed and format is checked 4032 if (super_class_index > 0 && super_klass.is_null()) { 4033 Symbol* sk = cp->klass_name_at(super_class_index); 4034 if (access_flags.is_interface()) { 4035 // Before attempting to resolve the superclass, check for class format 4036 // errors not checked yet. 4037 guarantee_property(sk == vmSymbols::java_lang_Object(), 4038 "Interfaces must have java.lang.Object as superclass in class file %s", 4039 CHECK_(nullHandle)); 4040 } 4041 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4042 class_loader, 4043 protection_domain, 4044 true, 4045 CHECK_(nullHandle)); 4046 4047 KlassHandle kh (THREAD, k); 4048 super_klass = instanceKlassHandle(THREAD, kh()); 4049 } 4050 if (super_klass.not_null()) { 4051 4052 if (super_klass->has_default_methods()) { 4053 has_default_methods = true; 4054 } 4055 4056 if (super_klass->is_interface()) { 4057 ResourceMark rm(THREAD); 4058 Exceptions::fthrow( 4059 THREAD_AND_LOCATION, 4060 vmSymbols::java_lang_IncompatibleClassChangeError(), 4061 "class %s has interface %s as super class", 4062 class_name->as_klass_external_name(), 4063 super_klass->external_name() 4064 ); 4065 return nullHandle; 4066 } 4067 // Make sure super class is not final 4068 if (super_klass->is_final()) { 4069 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4070 } 4071 } 4072 4073 // save super klass for error handling. 4074 _super_klass = super_klass; 4075 4076 // Compute the transitive list of all unique interfaces implemented by this class 4077 _transitive_interfaces = 4078 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4079 4080 // sort methods 4081 intArray* method_ordering = sort_methods(methods); 4082 4083 // promote flags from parse_methods() to the klass' flags 4084 access_flags.add_promoted_flags(promoted_flags.as_int()); 4085 4086 // Size of Java vtable (in words) 4087 int vtable_size = 0; 4088 int itable_size = 0; 4089 int num_miranda_methods = 0; 4090 4091 GrowableArray<Method*> all_mirandas(20); 4092 4093 klassVtable::compute_vtable_size_and_num_mirandas( 4094 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4095 access_flags, class_loader, class_name, local_interfaces, 4096 CHECK_(nullHandle)); 4097 4098 // Size of Java itable (in words) 4099 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4100 4101 FieldLayoutInfo info; 4102 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4103 4104 int total_oop_map_size2 = 4105 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4106 4107 // Compute reference type 4108 ReferenceType rt; 4109 if (super_klass() == NULL) { 4110 rt = REF_NONE; 4111 } else { 4112 rt = super_klass->reference_type(); 4113 } 4114 4115 // We can now create the basic Klass* for this klass 4116 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4117 vtable_size, 4118 itable_size, 4119 info.static_field_size, 4120 total_oop_map_size2, 4121 rt, 4122 access_flags, 4123 name, 4124 super_klass(), 4125 !host_klass.is_null(), 4126 CHECK_(nullHandle)); 4127 instanceKlassHandle this_klass (THREAD, _klass); 4128 4129 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4130 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4131 "sanity"); 4132 4133 // Fill in information already parsed 4134 this_klass->set_should_verify_class(verify); 4135 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4136 this_klass->set_layout_helper(lh); 4137 assert(this_klass->oop_is_instance(), "layout is correct"); 4138 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4139 // Not yet: supers are done below to support the new subtype-checking fields 4140 //this_klass->set_super(super_klass()); 4141 this_klass->set_class_loader_data(loader_data); 4142 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4143 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4144 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4145 4146 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4147 4148 if (has_final_method) { 4149 this_klass->set_has_final_method(); 4150 } 4151 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4152 // The InstanceKlass::_methods_jmethod_ids cache 4153 // is managed on the assumption that the initial cache 4154 // size is equal to the number of methods in the class. If 4155 // that changes, then InstanceKlass::idnum_can_increment() 4156 // has to be changed accordingly. 4157 this_klass->set_initial_method_idnum(methods->length()); 4158 this_klass->set_name(cp->klass_name_at(this_class_index)); 4159 if (is_anonymous()) // I am well known to myself 4160 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4161 4162 this_klass->set_minor_version(minor_version); 4163 this_klass->set_major_version(major_version); 4164 this_klass->set_has_default_methods(has_default_methods); 4165 this_klass->set_declares_default_methods(declares_default_methods); 4166 4167 if (!host_klass.is_null()) { 4168 assert (this_klass->is_anonymous(), "should be the same"); 4169 this_klass->set_host_klass(host_klass()); 4170 } 4171 4172 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4173 // (We used to do this lazily, but now we query it in Rewriter, 4174 // which is eagerly done for every method, so we might as well do it now, 4175 // when everything is fresh in memory.) 4176 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4177 for (int j = 0; j < methods->length(); j++) { 4178 methods->at(j)->init_intrinsic_id(); 4179 } 4180 } 4181 4182 if (cached_class_file != NULL) { 4183 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4184 this_klass->set_cached_class_file(cached_class_file); 4185 } 4186 4187 // Fill in field values obtained by parse_classfile_attributes 4188 if (parsed_annotations.has_any_annotations()) 4189 parsed_annotations.apply_to(this_klass); 4190 apply_parsed_class_attributes(this_klass); 4191 4192 // Miranda methods 4193 if ((num_miranda_methods > 0) || 4194 // if this class introduced new miranda methods or 4195 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4196 // super class exists and this class inherited miranda methods 4197 ) { 4198 this_klass->set_has_miranda_methods(); // then set a flag 4199 } 4200 4201 // Fill in information needed to compute superclasses. 4202 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4203 4204 // Initialize itable offset tables 4205 klassItable::setup_itable_offset_table(this_klass); 4206 4207 // Compute transitive closure of interfaces this class implements 4208 // Do final class setup 4209 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4210 4211 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4212 set_precomputed_flags(this_klass); 4213 4214 // reinitialize modifiers, using the InnerClasses attribute 4215 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4216 this_klass->set_modifier_flags(computed_modifiers); 4217 4218 // check if this class can access its super class 4219 check_super_class_access(this_klass, CHECK_(nullHandle)); 4220 4221 // check if this class can access its superinterfaces 4222 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4223 4224 // check if this class overrides any final method 4225 check_final_method_override(this_klass, CHECK_(nullHandle)); 4226 4227 // check that if this class is an interface then it doesn't have static methods 4228 if (this_klass->is_interface()) { 4229 /* An interface in a JAVA 8 classfile can be static */ 4230 if (_major_version < JAVA_8_VERSION) { 4231 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4232 } 4233 } 4234 4235 // Allocate mirror and initialize static fields 4236 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4237 CHECK_(nullHandle)); 4238 4239 // Generate any default methods - default methods are interface methods 4240 // that have a default implementation. This is new with Lambda project. 4241 if (has_default_methods ) { 4242 DefaultMethods::generate_default_methods( 4243 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4244 } 4245 4246 // Update the loader_data graph. 4247 record_defined_class_dependencies(this_klass, CHECK_NULL); 4248 4249 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4250 false /* not shared class */); 4251 4252 if (TraceClassLoading) { 4253 ResourceMark rm; 4254 // print in a single call to reduce interleaving of output 4255 if (cfs->source() != NULL) { 4256 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4257 cfs->source()); 4258 } else if (class_loader.is_null()) { 4259 Klass* caller = 4260 THREAD->is_Java_thread() 4261 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4262 : NULL; 4263 // caller can be NULL, for example, during a JVMTI VM_Init hook 4264 if (caller != NULL) { 4265 tty->print("[Loaded %s by instance of %s]\n", 4266 this_klass->external_name(), 4267 InstanceKlass::cast(caller)->external_name()); 4268 } else { 4269 tty->print("[Loaded %s]\n", this_klass->external_name()); 4270 } 4271 } else { 4272 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4273 InstanceKlass::cast(class_loader->klass())->external_name()); 4274 } 4275 } 4276 4277 if (TraceClassResolution) { 4278 ResourceMark rm; 4279 // print out the superclass. 4280 const char * from = this_klass()->external_name(); 4281 if (this_klass->java_super() != NULL) { 4282 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4283 } 4284 // print out each of the interface classes referred to by this class. 4285 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4286 if (local_interfaces != NULL) { 4287 int length = local_interfaces->length(); 4288 for (int i = 0; i < length; i++) { 4289 Klass* k = local_interfaces->at(i); 4290 InstanceKlass* to_class = InstanceKlass::cast(k); 4291 const char * to = to_class->external_name(); 4292 tty->print("RESOLVE %s %s (interface)\n", from, to); 4293 } 4294 } 4295 } 4296 4297 // preserve result across HandleMark 4298 preserve_this_klass = this_klass(); 4299 } 4300 4301 // Create new handle outside HandleMark (might be needed for 4302 // Extended Class Redefinition) 4303 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4304 debug_only(this_klass->verify();) 4305 4306 // Clear class if no error has occurred so destructor doesn't deallocate it 4307 _klass = NULL; 4308 return this_klass; 4309 } 4310 4311 // Destructor to clean up if there's an error 4312 ClassFileParser::~ClassFileParser() { 4313 MetadataFactory::free_metadata(_loader_data, _cp); 4314 MetadataFactory::free_array<u2>(_loader_data, _fields); 4315 4316 // Free methods 4317 InstanceKlass::deallocate_methods(_loader_data, _methods); 4318 4319 // beware of the Universe::empty_blah_array!! 4320 if (_inner_classes != Universe::the_empty_short_array()) { 4321 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4322 } 4323 4324 // Free interfaces 4325 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4326 _local_interfaces, _transitive_interfaces); 4327 4328 if (_combined_annotations != NULL) { 4329 // After all annotations arrays have been created, they are installed into the 4330 // Annotations object that will be assigned to the InstanceKlass being created. 4331 4332 // Deallocate the Annotations object and the installed annotations arrays. 4333 _combined_annotations->deallocate_contents(_loader_data); 4334 4335 // If the _combined_annotations pointer is non-NULL, 4336 // then the other annotations fields should have been cleared. 4337 assert(_annotations == NULL, "Should have been cleared"); 4338 assert(_type_annotations == NULL, "Should have been cleared"); 4339 assert(_fields_annotations == NULL, "Should have been cleared"); 4340 assert(_fields_type_annotations == NULL, "Should have been cleared"); 4341 } else { 4342 // If the annotations arrays were not installed into the Annotations object, 4343 // then they have to be deallocated explicitly. 4344 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4345 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4346 Annotations::free_contents(_loader_data, _fields_annotations); 4347 Annotations::free_contents(_loader_data, _fields_type_annotations); 4348 } 4349 4350 clear_class_metadata(); 4351 4352 // deallocate the klass if already created. Don't directly deallocate, but add 4353 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4354 // at a safepoint. 4355 if (_klass != NULL) { 4356 _loader_data->add_to_deallocate_list(_klass); 4357 } 4358 _klass = NULL; 4359 } 4360 4361 void ClassFileParser::print_field_layout(Symbol* name, 4362 Array<u2>* fields, 4363 constantPoolHandle cp, 4364 int instance_size, 4365 int instance_fields_start, 4366 int instance_fields_end, 4367 int static_fields_end) { 4368 tty->print("%s: field layout\n", name->as_klass_external_name()); 4369 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4370 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4371 if (!fs.access_flags().is_static()) { 4372 tty->print(" @%3d \"%s\" %s\n", 4373 fs.offset(), 4374 fs.name()->as_klass_external_name(), 4375 fs.signature()->as_klass_external_name()); 4376 } 4377 } 4378 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4379 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4380 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4381 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4382 if (fs.access_flags().is_static()) { 4383 tty->print(" @%3d \"%s\" %s\n", 4384 fs.offset(), 4385 fs.name()->as_klass_external_name(), 4386 fs.signature()->as_klass_external_name()); 4387 } 4388 } 4389 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4390 tty->print("\n"); 4391 } 4392 4393 unsigned int 4394 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4395 unsigned int nonstatic_oop_map_count, 4396 int first_nonstatic_oop_offset) { 4397 unsigned int map_count = 4398 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4399 if (nonstatic_oop_map_count > 0) { 4400 // We have oops to add to map 4401 if (map_count == 0) { 4402 map_count = nonstatic_oop_map_count; 4403 } else { 4404 // Check whether we should add a new map block or whether the last one can 4405 // be extended 4406 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4407 OopMapBlock* const last_map = first_map + map_count - 1; 4408 4409 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4410 if (next_offset == first_nonstatic_oop_offset) { 4411 // There is no gap bettwen superklass's last oop field and first 4412 // local oop field, merge maps. 4413 nonstatic_oop_map_count -= 1; 4414 } else { 4415 // Superklass didn't end with a oop field, add extra maps 4416 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4417 } 4418 map_count += nonstatic_oop_map_count; 4419 } 4420 } 4421 return map_count; 4422 } 4423 4424 4425 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4426 unsigned int nonstatic_oop_map_count, 4427 int* nonstatic_oop_offsets, 4428 unsigned int* nonstatic_oop_counts) { 4429 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4430 const InstanceKlass* const super = k->superklass(); 4431 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4432 if (super_count > 0) { 4433 // Copy maps from superklass 4434 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4435 for (unsigned int i = 0; i < super_count; ++i) { 4436 *this_oop_map++ = *super_oop_map++; 4437 } 4438 } 4439 4440 if (nonstatic_oop_map_count > 0) { 4441 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4442 // The counts differ because there is no gap between superklass's last oop 4443 // field and the first local oop field. Extend the last oop map copied 4444 // from the superklass instead of creating new one. 4445 nonstatic_oop_map_count--; 4446 nonstatic_oop_offsets++; 4447 this_oop_map--; 4448 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4449 this_oop_map++; 4450 } 4451 4452 // Add new map blocks, fill them 4453 while (nonstatic_oop_map_count-- > 0) { 4454 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4455 this_oop_map->set_count(*nonstatic_oop_counts++); 4456 this_oop_map++; 4457 } 4458 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4459 this_oop_map, "sanity"); 4460 } 4461 } 4462 4463 4464 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4465 Klass* super = k->super(); 4466 4467 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4468 // in which case we don't have to register objects as finalizable 4469 if (!_has_empty_finalizer) { 4470 if (_has_finalizer || 4471 (super != NULL && super->has_finalizer())) { 4472 k->set_has_finalizer(); 4473 } 4474 } 4475 4476 #ifdef ASSERT 4477 bool f = false; 4478 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4479 vmSymbols::void_method_signature()); 4480 if (m != NULL && !m->is_empty_method()) { 4481 f = true; 4482 } 4483 4484 // Spec doesn't prevent agent from redefinition of empty finalizer. 4485 // Despite the fact that it's generally bad idea and redefined finalizer 4486 // will not work as expected we shouldn't abort vm in this case 4487 if (!k->has_redefined_this_or_super()) { 4488 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4489 } 4490 #endif 4491 4492 // Check if this klass supports the java.lang.Cloneable interface 4493 if (SystemDictionary::Cloneable_klass_loaded()) { 4494 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4495 k->set_is_cloneable(); 4496 } 4497 } 4498 4499 // Check if this klass has a vanilla default constructor 4500 if (super == NULL) { 4501 // java.lang.Object has empty default constructor 4502 k->set_has_vanilla_constructor(); 4503 } else { 4504 if (super->has_vanilla_constructor() && 4505 _has_vanilla_constructor) { 4506 k->set_has_vanilla_constructor(); 4507 } 4508 #ifdef ASSERT 4509 bool v = false; 4510 if (super->has_vanilla_constructor()) { 4511 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4512 ), vmSymbols::void_method_signature()); 4513 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4514 v = true; 4515 } 4516 } 4517 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4518 #endif 4519 } 4520 4521 // If it cannot be fast-path allocated, set a bit in the layout helper. 4522 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4523 assert(k->size_helper() > 0, "layout_helper is initialized"); 4524 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4525 || k->is_abstract() || k->is_interface() 4526 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4527 || k->size_helper() >= FastAllocateSizeLimit) { 4528 // Forbid fast-path allocation. 4529 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4530 k->set_layout_helper(lh); 4531 } 4532 } 4533 4534 // Attach super classes and interface classes to class loader data 4535 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4536 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4537 if (defining_loader_data->is_the_null_class_loader_data()) { 4538 // Dependencies to null class loader data are implicit. 4539 return; 4540 } else { 4541 // add super class dependency 4542 Klass* super = defined_klass->super(); 4543 if (super != NULL) { 4544 defining_loader_data->record_dependency(super, CHECK); 4545 } 4546 4547 // add super interface dependencies 4548 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4549 if (local_interfaces != NULL) { 4550 int length = local_interfaces->length(); 4551 for (int i = 0; i < length; i++) { 4552 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4553 } 4554 } 4555 } 4556 } 4557 4558 // utility methods for appending an array with check for duplicates 4559 4560 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4561 // iterate over new interfaces 4562 for (int i = 0; i < ifs->length(); i++) { 4563 Klass* e = ifs->at(i); 4564 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4565 // add new interface 4566 result->append_if_missing(e); 4567 } 4568 } 4569 4570 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4571 instanceKlassHandle super, 4572 Array<Klass*>* local_ifs, TRAPS) { 4573 // Compute maximum size for transitive interfaces 4574 int max_transitive_size = 0; 4575 int super_size = 0; 4576 // Add superclass transitive interfaces size 4577 if (super.not_null()) { 4578 super_size = super->transitive_interfaces()->length(); 4579 max_transitive_size += super_size; 4580 } 4581 // Add local interfaces' super interfaces 4582 int local_size = local_ifs->length(); 4583 for (int i = 0; i < local_size; i++) { 4584 Klass* l = local_ifs->at(i); 4585 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4586 } 4587 // Finally add local interfaces 4588 max_transitive_size += local_size; 4589 // Construct array 4590 if (max_transitive_size == 0) { 4591 // no interfaces, use canonicalized array 4592 return Universe::the_empty_klass_array(); 4593 } else if (max_transitive_size == super_size) { 4594 // no new local interfaces added, share superklass' transitive interface array 4595 return super->transitive_interfaces(); 4596 } else if (max_transitive_size == local_size) { 4597 // only local interfaces added, share local interface array 4598 return local_ifs; 4599 } else { 4600 ResourceMark rm; 4601 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4602 4603 // Copy down from superclass 4604 if (super.not_null()) { 4605 append_interfaces(result, super->transitive_interfaces()); 4606 } 4607 4608 // Copy down from local interfaces' superinterfaces 4609 for (int i = 0; i < local_ifs->length(); i++) { 4610 Klass* l = local_ifs->at(i); 4611 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4612 } 4613 // Finally add local interfaces 4614 append_interfaces(result, local_ifs); 4615 4616 // length will be less than the max_transitive_size if duplicates were removed 4617 int length = result->length(); 4618 assert(length <= max_transitive_size, "just checking"); 4619 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4620 for (int i = 0; i < length; i++) { 4621 Klass* e = result->at(i); 4622 assert(e != NULL, "just checking"); 4623 new_result->at_put(i, e); 4624 } 4625 return new_result; 4626 } 4627 } 4628 4629 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4630 Klass* super = this_klass->super(); 4631 if ((super != NULL) && 4632 (!Reflection::verify_class_access(this_klass(), super, false))) { 4633 ResourceMark rm(THREAD); 4634 Exceptions::fthrow( 4635 THREAD_AND_LOCATION, 4636 vmSymbols::java_lang_IllegalAccessError(), 4637 "class %s cannot access its superclass %s", 4638 this_klass->external_name(), 4639 InstanceKlass::cast(super)->external_name() 4640 ); 4641 return; 4642 } 4643 } 4644 4645 4646 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4647 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4648 int lng = local_interfaces->length(); 4649 for (int i = lng - 1; i >= 0; i--) { 4650 Klass* k = local_interfaces->at(i); 4651 assert (k != NULL && k->is_interface(), "invalid interface"); 4652 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4653 ResourceMark rm(THREAD); 4654 Exceptions::fthrow( 4655 THREAD_AND_LOCATION, 4656 vmSymbols::java_lang_IllegalAccessError(), 4657 "class %s cannot access its superinterface %s", 4658 this_klass->external_name(), 4659 InstanceKlass::cast(k)->external_name() 4660 ); 4661 return; 4662 } 4663 } 4664 } 4665 4666 4667 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4668 Array<Method*>* methods = this_klass->methods(); 4669 int num_methods = methods->length(); 4670 4671 // go thru each method and check if it overrides a final method 4672 for (int index = 0; index < num_methods; index++) { 4673 Method* m = methods->at(index); 4674 4675 // skip private, static, and <init> methods 4676 if ((!m->is_private() && !m->is_static()) && 4677 (m->name() != vmSymbols::object_initializer_name())) { 4678 4679 Symbol* name = m->name(); 4680 Symbol* signature = m->signature(); 4681 Klass* k = this_klass->super(); 4682 Method* super_m = NULL; 4683 while (k != NULL) { 4684 // skip supers that don't have final methods. 4685 if (k->has_final_method()) { 4686 // lookup a matching method in the super class hierarchy 4687 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4688 if (super_m == NULL) { 4689 break; // didn't find any match; get out 4690 } 4691 4692 if (super_m->is_final() && !super_m->is_static() && 4693 // matching method in super is final, and not static 4694 (Reflection::verify_field_access(this_klass(), 4695 super_m->method_holder(), 4696 super_m->method_holder(), 4697 super_m->access_flags(), false)) 4698 // this class can access super final method and therefore override 4699 ) { 4700 ResourceMark rm(THREAD); 4701 Exceptions::fthrow( 4702 THREAD_AND_LOCATION, 4703 vmSymbols::java_lang_VerifyError(), 4704 "class %s overrides final method %s.%s%s", 4705 this_klass->external_name(), 4706 super_m->method_holder()->external_name(), 4707 name->as_C_string(), 4708 signature->as_C_string() 4709 ); 4710 return; 4711 } 4712 4713 // continue to look from super_m's holder's super. 4714 k = super_m->method_holder()->super(); 4715 continue; 4716 } 4717 4718 k = k->super(); 4719 } 4720 } 4721 } 4722 } 4723 4724 4725 // assumes that this_klass is an interface 4726 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4727 assert(this_klass->is_interface(), "not an interface"); 4728 Array<Method*>* methods = this_klass->methods(); 4729 int num_methods = methods->length(); 4730 4731 for (int index = 0; index < num_methods; index++) { 4732 Method* m = methods->at(index); 4733 // if m is static and not the init method, throw a verify error 4734 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4735 ResourceMark rm(THREAD); 4736 Exceptions::fthrow( 4737 THREAD_AND_LOCATION, 4738 vmSymbols::java_lang_VerifyError(), 4739 "Illegal static method %s in interface %s", 4740 m->name()->as_C_string(), 4741 this_klass->external_name() 4742 ); 4743 return; 4744 } 4745 } 4746 } 4747 4748 // utility methods for format checking 4749 4750 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4751 if (!_need_verify) { return; } 4752 4753 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4754 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4755 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4756 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4757 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4758 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4759 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4760 4761 if ((is_abstract && is_final) || 4762 (is_interface && !is_abstract) || 4763 (is_interface && major_gte_15 && (is_super || is_enum)) || 4764 (!is_interface && major_gte_15 && is_annotation)) { 4765 ResourceMark rm(THREAD); 4766 Exceptions::fthrow( 4767 THREAD_AND_LOCATION, 4768 vmSymbols::java_lang_ClassFormatError(), 4769 "Illegal class modifiers in class %s: 0x%X", 4770 _class_name->as_C_string(), flags 4771 ); 4772 return; 4773 } 4774 } 4775 4776 bool ClassFileParser::has_illegal_visibility(jint flags) { 4777 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4778 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4779 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4780 4781 return ((is_public && is_protected) || 4782 (is_public && is_private) || 4783 (is_protected && is_private)); 4784 } 4785 4786 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4787 u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4788 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4789 (major <= max_version) && 4790 ((major != max_version) || 4791 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4792 } 4793 4794 void ClassFileParser::verify_legal_field_modifiers( 4795 jint flags, bool is_interface, TRAPS) { 4796 if (!_need_verify) { return; } 4797 4798 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4799 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4800 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4801 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4802 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4803 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4804 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4805 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4806 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4807 4808 bool is_illegal = false; 4809 4810 if (is_interface) { 4811 if (!is_public || !is_static || !is_final || is_private || 4812 is_protected || is_volatile || is_transient || 4813 (major_gte_15 && is_enum)) { 4814 is_illegal = true; 4815 } 4816 } else { // not interface 4817 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4818 is_illegal = true; 4819 } 4820 } 4821 4822 if (is_illegal) { 4823 ResourceMark rm(THREAD); 4824 Exceptions::fthrow( 4825 THREAD_AND_LOCATION, 4826 vmSymbols::java_lang_ClassFormatError(), 4827 "Illegal field modifiers in class %s: 0x%X", 4828 _class_name->as_C_string(), flags); 4829 return; 4830 } 4831 } 4832 4833 void ClassFileParser::verify_legal_method_modifiers( 4834 jint flags, bool is_interface, Symbol* name, TRAPS) { 4835 if (!_need_verify) { return; } 4836 4837 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4838 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4839 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4840 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4841 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4842 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4843 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4844 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4845 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4846 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4847 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4848 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4849 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4850 4851 bool is_illegal = false; 4852 4853 if (is_interface) { 4854 if (major_gte_8) { 4855 // Class file version is JAVA_8_VERSION or later Methods of 4856 // interfaces may set any of the flags except ACC_PROTECTED, 4857 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4858 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4859 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4860 (is_native || is_protected || is_final || is_synchronized) || 4861 // If a specific method of a class or interface has its 4862 // ACC_ABSTRACT flag set, it must not have any of its 4863 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4864 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4865 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4866 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4867 (is_abstract && (is_private || is_static || is_strict))) { 4868 is_illegal = true; 4869 } 4870 } else if (major_gte_15) { 4871 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4872 if (!is_public || is_static || is_final || is_synchronized || 4873 is_native || !is_abstract || is_strict) { 4874 is_illegal = true; 4875 } 4876 } else { 4877 // Class file version is pre-JAVA_1_5_VERSION 4878 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4879 is_illegal = true; 4880 } 4881 } 4882 } else { // not interface 4883 if (is_initializer) { 4884 if (is_static || is_final || is_synchronized || is_native || 4885 is_abstract || (major_gte_15 && is_bridge)) { 4886 is_illegal = true; 4887 } 4888 } else { // not initializer 4889 if (is_abstract) { 4890 if ((is_final || is_native || is_private || is_static || 4891 (major_gte_15 && (is_synchronized || is_strict)))) { 4892 is_illegal = true; 4893 } 4894 } 4895 if (has_illegal_visibility(flags)) { 4896 is_illegal = true; 4897 } 4898 } 4899 } 4900 4901 if (is_illegal) { 4902 ResourceMark rm(THREAD); 4903 Exceptions::fthrow( 4904 THREAD_AND_LOCATION, 4905 vmSymbols::java_lang_ClassFormatError(), 4906 "Method %s in class %s has illegal modifiers: 0x%X", 4907 name->as_C_string(), _class_name->as_C_string(), flags); 4908 return; 4909 } 4910 } 4911 4912 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4913 assert(_need_verify, "only called when _need_verify is true"); 4914 int i = 0; 4915 int count = length >> 2; 4916 for (int k=0; k<count; k++) { 4917 unsigned char b0 = buffer[i]; 4918 unsigned char b1 = buffer[i+1]; 4919 unsigned char b2 = buffer[i+2]; 4920 unsigned char b3 = buffer[i+3]; 4921 // For an unsigned char v, 4922 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4923 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4924 unsigned char res = b0 | b0 - 1 | 4925 b1 | b1 - 1 | 4926 b2 | b2 - 1 | 4927 b3 | b3 - 1; 4928 if (res >= 128) break; 4929 i += 4; 4930 } 4931 for(; i < length; i++) { 4932 unsigned short c; 4933 // no embedded zeros 4934 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4935 if(buffer[i] < 128) { 4936 continue; 4937 } 4938 if ((i + 5) < length) { // see if it's legal supplementary character 4939 if (UTF8::is_supplementary_character(&buffer[i])) { 4940 c = UTF8::get_supplementary_character(&buffer[i]); 4941 i += 5; 4942 continue; 4943 } 4944 } 4945 switch (buffer[i] >> 4) { 4946 default: break; 4947 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4948 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4949 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4950 c = (buffer[i] & 0x1F) << 6; 4951 i++; 4952 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4953 c += buffer[i] & 0x3F; 4954 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4955 // for classes with major > 47, c must a null or a character in its shortest form 4956 break; 4957 } 4958 } 4959 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4960 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4961 c = (buffer[i] & 0xF) << 12; 4962 i += 2; 4963 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4964 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4965 if (_major_version <= 47 || c >= 0x800) { 4966 // for classes with major > 47, c must be in its shortest form 4967 break; 4968 } 4969 } 4970 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4971 } // end of switch 4972 } // end of for 4973 } 4974 4975 // Checks if name is a legal class name. 4976 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4977 if (!_need_verify || _relax_verify) { return; } 4978 4979 char buf[fixed_buffer_size]; 4980 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4981 unsigned int length = name->utf8_length(); 4982 bool legal = false; 4983 4984 if (length > 0) { 4985 char* p; 4986 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4987 p = skip_over_field_signature(bytes, false, length, CHECK); 4988 legal = (p != NULL) && ((p - bytes) == (int)length); 4989 } else if (_major_version < JAVA_1_5_VERSION) { 4990 if (bytes[0] != '<') { 4991 p = skip_over_field_name(bytes, true, length); 4992 legal = (p != NULL) && ((p - bytes) == (int)length); 4993 } 4994 } else { 4995 // 4900761: relax the constraints based on JSR202 spec 4996 // Class names may be drawn from the entire Unicode character set. 4997 // Identifiers between '/' must be unqualified names. 4998 // The utf8 string has been verified when parsing cpool entries. 4999 legal = verify_unqualified_name(bytes, length, LegalClass); 5000 } 5001 } 5002 if (!legal) { 5003 ResourceMark rm(THREAD); 5004 Exceptions::fthrow( 5005 THREAD_AND_LOCATION, 5006 vmSymbols::java_lang_ClassFormatError(), 5007 "Illegal class name \"%s\" in class file %s", bytes, 5008 _class_name->as_C_string() 5009 ); 5010 return; 5011 } 5012 } 5013 5014 // Checks if name is a legal field name. 5015 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 5016 if (!_need_verify || _relax_verify) { return; } 5017 5018 char buf[fixed_buffer_size]; 5019 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5020 unsigned int length = name->utf8_length(); 5021 bool legal = false; 5022 5023 if (length > 0) { 5024 if (_major_version < JAVA_1_5_VERSION) { 5025 if (bytes[0] != '<') { 5026 char* p = skip_over_field_name(bytes, false, length); 5027 legal = (p != NULL) && ((p - bytes) == (int)length); 5028 } 5029 } else { 5030 // 4881221: relax the constraints based on JSR202 spec 5031 legal = verify_unqualified_name(bytes, length, LegalField); 5032 } 5033 } 5034 5035 if (!legal) { 5036 ResourceMark rm(THREAD); 5037 Exceptions::fthrow( 5038 THREAD_AND_LOCATION, 5039 vmSymbols::java_lang_ClassFormatError(), 5040 "Illegal field name \"%s\" in class %s", bytes, 5041 _class_name->as_C_string() 5042 ); 5043 return; 5044 } 5045 } 5046 5047 // Checks if name is a legal method name. 5048 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 5049 if (!_need_verify || _relax_verify) { return; } 5050 5051 assert(name != NULL, "method name is null"); 5052 char buf[fixed_buffer_size]; 5053 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5054 unsigned int length = name->utf8_length(); 5055 bool legal = false; 5056 5057 if (length > 0) { 5058 if (bytes[0] == '<') { 5059 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5060 legal = true; 5061 } 5062 } else if (_major_version < JAVA_1_5_VERSION) { 5063 char* p; 5064 p = skip_over_field_name(bytes, false, length); 5065 legal = (p != NULL) && ((p - bytes) == (int)length); 5066 } else { 5067 // 4881221: relax the constraints based on JSR202 spec 5068 legal = verify_unqualified_name(bytes, length, LegalMethod); 5069 } 5070 } 5071 5072 if (!legal) { 5073 ResourceMark rm(THREAD); 5074 Exceptions::fthrow( 5075 THREAD_AND_LOCATION, 5076 vmSymbols::java_lang_ClassFormatError(), 5077 "Illegal method name \"%s\" in class %s", bytes, 5078 _class_name->as_C_string() 5079 ); 5080 return; 5081 } 5082 } 5083 5084 5085 // Checks if signature is a legal field signature. 5086 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5087 if (!_need_verify) { return; } 5088 5089 char buf[fixed_buffer_size]; 5090 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5091 unsigned int length = signature->utf8_length(); 5092 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5093 5094 if (p == NULL || (p - bytes) != (int)length) { 5095 throwIllegalSignature("Field", name, signature, CHECK); 5096 } 5097 } 5098 5099 // Checks if signature is a legal method signature. 5100 // Returns number of parameters 5101 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5102 if (!_need_verify) { 5103 // make sure caller's args_size will be less than 0 even for non-static 5104 // method so it will be recomputed in compute_size_of_parameters(). 5105 return -2; 5106 } 5107 5108 unsigned int args_size = 0; 5109 char buf[fixed_buffer_size]; 5110 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5111 unsigned int length = signature->utf8_length(); 5112 char* nextp; 5113 5114 // The first character must be a '(' 5115 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5116 length--; 5117 // Skip over legal field signatures 5118 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5119 while ((length > 0) && (nextp != NULL)) { 5120 args_size++; 5121 if (p[0] == 'J' || p[0] == 'D') { 5122 args_size++; 5123 } 5124 length -= nextp - p; 5125 p = nextp; 5126 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5127 } 5128 // The first non-signature thing better be a ')' 5129 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5130 length--; 5131 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5132 // All internal methods must return void 5133 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5134 return args_size; 5135 } 5136 } else { 5137 // Now we better just have a return value 5138 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5139 if (nextp && ((int)length == (nextp - p))) { 5140 return args_size; 5141 } 5142 } 5143 } 5144 } 5145 // Report error 5146 throwIllegalSignature("Method", name, signature, CHECK_0); 5147 return 0; 5148 } 5149 5150 5151 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5152 // Method names also may not contain the characters '<' or '>', unless <init> 5153 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5154 // method. Because these names have been checked as special cases before 5155 // calling this method in verify_legal_method_name. 5156 bool ClassFileParser::verify_unqualified_name( 5157 char* name, unsigned int length, int type) { 5158 jchar ch; 5159 5160 for (char* p = name; p != name + length; ) { 5161 ch = *p; 5162 if (ch < 128) { 5163 p++; 5164 if (ch == '.' || ch == ';' || ch == '[' ) { 5165 return false; // do not permit '.', ';', or '[' 5166 } 5167 if (type != LegalClass && ch == '/') { 5168 return false; // do not permit '/' unless it's class name 5169 } 5170 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5171 return false; // do not permit '<' or '>' in method names 5172 } 5173 } else { 5174 char* tmp_p = UTF8::next(p, &ch); 5175 p = tmp_p; 5176 } 5177 } 5178 return true; 5179 } 5180 5181 5182 // Take pointer to a string. Skip over the longest part of the string that could 5183 // be taken as a fieldname. Allow '/' if slash_ok is true. 5184 // Return a pointer to just past the fieldname. 5185 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5186 // being true, we saw consecutive slashes (meaning we were looking for a 5187 // qualified path but found something that was badly-formed). 5188 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5189 char* p; 5190 jchar ch; 5191 jboolean last_is_slash = false; 5192 jboolean not_first_ch = false; 5193 5194 for (p = name; p != name + length; not_first_ch = true) { 5195 char* old_p = p; 5196 ch = *p; 5197 if (ch < 128) { 5198 p++; 5199 // quick check for ascii 5200 if ((ch >= 'a' && ch <= 'z') || 5201 (ch >= 'A' && ch <= 'Z') || 5202 (ch == '_' || ch == '$') || 5203 (not_first_ch && ch >= '0' && ch <= '9')) { 5204 last_is_slash = false; 5205 continue; 5206 } 5207 if (slash_ok && ch == '/') { 5208 if (last_is_slash) { 5209 return NULL; // Don't permit consecutive slashes 5210 } 5211 last_is_slash = true; 5212 continue; 5213 } 5214 } else { 5215 jint unicode_ch; 5216 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5217 p = tmp_p; 5218 last_is_slash = false; 5219 // Check if ch is Java identifier start or is Java identifier part 5220 // 4672820: call java.lang.Character methods directly without generating separate tables. 5221 EXCEPTION_MARK; 5222 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5223 5224 // return value 5225 JavaValue result(T_BOOLEAN); 5226 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5227 JavaCallArguments args; 5228 args.push_int(unicode_ch); 5229 5230 // public static boolean isJavaIdentifierStart(char ch); 5231 JavaCalls::call_static(&result, 5232 klass, 5233 vmSymbols::isJavaIdentifierStart_name(), 5234 vmSymbols::int_bool_signature(), 5235 &args, 5236 THREAD); 5237 5238 if (HAS_PENDING_EXCEPTION) { 5239 CLEAR_PENDING_EXCEPTION; 5240 return 0; 5241 } 5242 if (result.get_jboolean()) { 5243 continue; 5244 } 5245 5246 if (not_first_ch) { 5247 // public static boolean isJavaIdentifierPart(char ch); 5248 JavaCalls::call_static(&result, 5249 klass, 5250 vmSymbols::isJavaIdentifierPart_name(), 5251 vmSymbols::int_bool_signature(), 5252 &args, 5253 THREAD); 5254 5255 if (HAS_PENDING_EXCEPTION) { 5256 CLEAR_PENDING_EXCEPTION; 5257 return 0; 5258 } 5259 5260 if (result.get_jboolean()) { 5261 continue; 5262 } 5263 } 5264 } 5265 return (not_first_ch) ? old_p : NULL; 5266 } 5267 return (not_first_ch) ? p : NULL; 5268 } 5269 5270 5271 // Take pointer to a string. Skip over the longest part of the string that could 5272 // be taken as a field signature. Allow "void" if void_ok. 5273 // Return a pointer to just past the signature. 5274 // Return NULL if no legal signature is found. 5275 char* ClassFileParser::skip_over_field_signature(char* signature, 5276 bool void_ok, 5277 unsigned int length, 5278 TRAPS) { 5279 unsigned int array_dim = 0; 5280 while (length > 0) { 5281 switch (signature[0]) { 5282 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5283 case JVM_SIGNATURE_BOOLEAN: 5284 case JVM_SIGNATURE_BYTE: 5285 case JVM_SIGNATURE_CHAR: 5286 case JVM_SIGNATURE_SHORT: 5287 case JVM_SIGNATURE_INT: 5288 case JVM_SIGNATURE_FLOAT: 5289 case JVM_SIGNATURE_LONG: 5290 case JVM_SIGNATURE_DOUBLE: 5291 return signature + 1; 5292 case JVM_SIGNATURE_CLASS: { 5293 if (_major_version < JAVA_1_5_VERSION) { 5294 // Skip over the class name if one is there 5295 char* p = skip_over_field_name(signature + 1, true, --length); 5296 5297 // The next character better be a semicolon 5298 if (p && (p - signature) > 1 && p[0] == ';') { 5299 return p + 1; 5300 } 5301 } else { 5302 // 4900761: For class version > 48, any unicode is allowed in class name. 5303 length--; 5304 signature++; 5305 while (length > 0 && signature[0] != ';') { 5306 if (signature[0] == '.') { 5307 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5308 } 5309 length--; 5310 signature++; 5311 } 5312 if (signature[0] == ';') { return signature + 1; } 5313 } 5314 5315 return NULL; 5316 } 5317 case JVM_SIGNATURE_ARRAY: 5318 array_dim++; 5319 if (array_dim > 255) { 5320 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5321 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5322 } 5323 // The rest of what's there better be a legal signature 5324 signature++; 5325 length--; 5326 void_ok = false; 5327 break; 5328 5329 default: 5330 return NULL; 5331 } 5332 } 5333 return NULL; 5334 }